Here’s some background on filter cards
https://mirion.s3.amazonaws.com/cms4_mirion/files/pdf/spec-sheets/doc010295en-a_icam_fixed_filters.pdf?1579456643
A PTFE type from Milipore was $398/100 they didn’t have a price
on the glass fiber type and they are not card mounted
I don’t have a price from Mirion or Jeff yet but get ready to
choke.
Dud
|
Re: New_Filter_Alpha_Spectrum_LOG
Geo,
This was run with the IMPEX
filter. When looking at alpha spectra use the linear Y as peak tail and relative
size are important. Notice that your Po-214 7.68 MeV tails are over lapping the
6.0 MeV Po-218. The actual energy will be where the high energy side of the peak
starts not the actual highest point on the peak so these points should be in
the clear. I’d like to see what your spectra look like in both Linear and log.
I suspect the filter that was used is too porous for alpha spec work and is
giving some very long tails.
Dud
?
?
 
?
????? Linear?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????????????????????????????????? Log
?
?
Geo,
Are those large tails due
to using a log display or is it the Po getting embedded too deep into the
filter material that is too porous for alpha spec work. What is the material
and micron size?
What does the spectra look
like in linear space?
Dud
?
?
?
Under?VIEW,
DISPLAY,?chose
LOG and LINE Drawing. Here's a scan I can
recognize. Also, photo of Rn-222 Alpha energies chart.
Geo
|
Re: Whatman filtercard clone.
Sounds like a plan. Thanks, found one for a good price there.
Ordering now.
George?
----- Original Message ----- From: Nick Andrews <nickjandrews@...> To: [email protected]Sent: Tue, 31 May 2022 13:23:15 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Whatman filtercard clone.
Maybe I should go check to see if I doi have the 1" size!
Amazon.? We got one next day delivery for about $130, caps are about $7-15.? I think specs said 1/5hp, there was a 1/4hp in it, we installed a 1/3hp.? It's a 2.5 ton unit, small for the house.? Works better with new and bigger fan!? Looking at conversion to two mini-split systems for 6 zones, and just gut the evap coils in current unit but keep it as a continuous-fan air handler for circulation.? Install better filtration, etc.? For the shed/shop I'll want a 12k-20k Btu rating wall mount, the 5 interior units for the house would be ceiling mount 9k-12k Btu ratings.? I can buy an 11# tank of R-410a and the gauge set for far less than an installer would charge.
Yep those gasket punches will do fine. Wish I had a sert. Do have indiviual ones that I need but no 1"
Say where's a good supplier to get a new Trane compatible AC Fan motor and all new2 AC capacitors for the condenser box outside? The motor is 220V, 1Ph, 1/3HP1 speed,1/2" fan bore shaft.WW94X328?
We got no Graingers' within 100 miles.? George?
George?
----- Original Message ----- From: Nick Andrews < nickjandrews@...> To: [email protected]Sent: Tue, 31 May 2022 10:37:43 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Whatman filtercard clone.
Sweet!? I want some.? I am thinking that gasket punch set I bought will be nice to make a clean hole in the paper material...
I'm flying up to OKC this afternoon, back Thursday.? Hope to be doing more testing this weekend.
On my Impex, using the Gast pump, it provides just the right amount of air the sensor wants.? I placed a piece of paper 1/2" from the pump's exhaust to check for oil fog emanating and after an hour there was no sign of anything on the white paper.? I think the glass bowl adequately traps any oil.? And yes, still running it on 120vac even though the motor nameplate reads 230.? All of these pumps I looked at on ebay and the mfr site refer to 120vac operation, so...
In remote outdoor air samplers, moving filters are the norm. This allows filter changing without an the sites. IMPEX has such a head, we don't have that, nor would I want that option. I do have some rolls of filter material from such a site, new, sealed in tin cans and further sealed in factory plastic bags That filter material is glass fiber on paper backing. What came in the Impex is similar but seems to have a mesh interlayer. Looking closely at the supplied filter there are pinholes present. A clone of the filter card was attempted. When used to replace the worn-out test filter as suppled, everything changed on the spectrum readout, for the better. We will of course consider using the OEM filters for serious work but these will be no cost playthings to gain experience. Now the PO peaks from Radon 222 daughters seem to be falling much more in line with predicted values. No other changes made. There are still other issues that need attending to, but those have been there since day 1, it's probably a matter of more training needed. PS if you request some of there be aware they have a textured? side which goes towards the sensor (i.e. UP). It covers a 25mm hole perfectly. The cards used here are double weight 3X5's because it's what I had. 4X6 would be better raw material, that size could simply be folded in half longways forming a 'book", trimmed to size using the original card as a template, the filter material secured inside and the edges taped shut It a pleasure to see the correct energy peaks from the Po species. I suggest printing the U-238 and Th-232 decay chains from the INL "Natural Decay Series: Uranium, Radium, and Thorium" and where it shows the alpha decays, pencil in the correct energy levels. This really helps not having to remember or look up what's what, If you don't have that link, it's also on my webpage K0FF@...PS Readings will be different on all instruments now, the weather has warmed, the widows screened,? open,? and an attic fan pumping fresh air in. It should prove interesting to retest everything, as the natural air should have far less Rn-222 present. A topic I would like to see discussed here is the broadening of the peaks, due to interaction of the Alpha Particles with matter (air). Geo Pics attached ![Filter_Clone.jpg]() ![New_Filter_Spectrum_10-31-2022_small.jpg]()
|
Re: Alpha and Beta particle Spec
Since day 1 the main radon PEAK was centered between 3 and 4 MeV. Could find no reason, changed the filter, no other changes, it corrected itself to proper MeV???????? ? Don't know why.?
Darndest thing. But makes me happy!
George?
----- Original Message ----- From: Dude <dfemer@...> To: [email protected]Sent: Tue, 31 May 2022 12:41:00 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta particle Spec
Explain this a bit I don’t
understand what you’re saying. Dud ? ? This one since the
beginning has its main peal showing at just above 3.5MeV
|
Re: New_Filter_Alpha_Spectrum_LOG
Geo,
Are those large tails due
to using a log display or is it the Po getting embedded too deep into the
filter material that is too porous for alpha spec work. What is the material
and micron size?
What does the spectra look
like in linear space?
Dud
?
?
?
Under?VIEW,
DISPLAY,?chose
LOG and LINE Drawing. Here's a scan I can
recognize. Also, photo of Rn-222 Alpha energies chart.
Geo
|
Re: Alpha and Beta particle Spec
Geo,
Interesting unit but it’s technically
a Working Level type instrument in that it doesn’t discriminate between Rn and
Th it just counts total decay alpha energy in the air which is a WL measurement.
its calibrated only to radon so any thoron activity is lumped into the reported
Rn-222.
In that it samples using
diffusion the clever electrostatic filter must be on all the time so don’t let
the battery die.
Dud
?
?
CRM--510 also logs
temperature, relative humidity, and Barometric pressure against radon to
correlate storm fronts and furnace cycling.
toggle quoted message
Show quoted text
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 23:28:51 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
What is a ?CRM-510? How does
it measure the ?radon?. I hate to say it but if it’s off and in storage
it’s
not sampling or measuring radon. Old last measurement maybe?
Dud
?This thing connects to
Radnet too.
Alan, I, Peter and others
are looking towards lab alpha spec with the Eberline 6A, WL meters? and
others incl. NIM. And other solid-state setups.
Plugged in the CRM-510 in
same room with the IMPEX, within 10 minutes it was reading 2.4 pCi/L.
But it never shuts off, the
ion chamber is on even in storage so, it's hot as soon as you activate the
electronics.
|
Re: Whatman filtercard clone.
Maybe I should go check to see if I doi have the 1" size!
Amazon.? We got one next day delivery for about $130, caps are about $7-15.? I think specs said 1/5hp, there was a 1/4hp in it, we installed a 1/3hp.? It's a 2.5 ton unit, small for the house.? Works better with new and bigger fan!? Looking at conversion to two mini-split systems for 6 zones, and just gut the evap coils in current unit but keep it as a continuous-fan air handler for circulation.? Install better filtration, etc.? For the shed/shop I'll want a 12k-20k Btu rating wall mount, the 5 interior units for the house would be ceiling mount 9k-12k Btu ratings.? I can buy an 11# tank of R-410a and the gauge set for far less than an installer would charge.
Yep those gasket punches will do fine. Wish I had a sert. Do have indiviual ones that I need but no 1"
Say where's a good supplier to get a new Trane compatible AC Fan motor and all new2 AC capacitors for the condenser box outside? The motor is 220V, 1Ph, 1/3HP1 speed,1/2" fan bore shaft.WW94X328?
We got no Graingers' within 100 miles.? George?
George?
----- Original Message ----- From: Nick Andrews < nickjandrews@...> To: [email protected]Sent: Tue, 31 May 2022 10:37:43 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Whatman filtercard clone.
Sweet!? I want some.? I am thinking that gasket punch set I bought will be nice to make a clean hole in the paper material...
I'm flying up to OKC this afternoon, back Thursday.? Hope to be doing more testing this weekend.
On my Impex, using the Gast pump, it provides just the right amount of air the sensor wants.? I placed a piece of paper 1/2" from the pump's exhaust to check for oil fog emanating and after an hour there was no sign of anything on the white paper.? I think the glass bowl adequately traps any oil.? And yes, still running it on 120vac even though the motor nameplate reads 230.? All of these pumps I looked at on ebay and the mfr site refer to 120vac operation, so...
In remote outdoor air samplers, moving filters are the norm. This allows filter changing without an the sites. IMPEX has such a head, we don't have that, nor would I want that option. I do have some rolls of filter material from such a site, new, sealed in tin cans and further sealed in factory plastic bags That filter material is glass fiber on paper backing. What came in the Impex is similar but seems to have a mesh interlayer. Looking closely at the supplied filter there are pinholes present. A clone of the filter card was attempted. When used to replace the worn-out test filter as suppled, everything changed on the spectrum readout, for the better. We will of course consider using the OEM filters for serious work but these will be no cost playthings to gain experience. Now the PO peaks from Radon 222 daughters seem to be falling much more in line with predicted values. No other changes made. There are still other issues that need attending to, but those have been there since day 1, it's probably a matter of more training needed. PS if you request some of there be aware they have a textured? side which goes towards the sensor (i.e. UP). It covers a 25mm hole perfectly. The cards used here are double weight 3X5's because it's what I had. 4X6 would be better raw material, that size could simply be folded in half longways forming a 'book", trimmed to size using the original card as a template, the filter material secured inside and the edges taped shut It a pleasure to see the correct energy peaks from the Po species. I suggest printing the U-238 and Th-232 decay chains from the INL "Natural Decay Series: Uranium, Radium, and Thorium" and where it shows the alpha decays, pencil in the correct energy levels. This really helps not having to remember or look up what's what, If you don't have that link, it's also on my webpage K0FF@...PS Readings will be different on all instruments now, the weather has warmed, the widows screened,? open,? and an attic fan pumping fresh air in. It should prove interesting to retest everything, as the natural air should have far less Rn-222 present. A topic I would like to see discussed here is the broadening of the peaks, due to interaction of the Alpha Particles with matter (air). Geo Pics attached ![Filter_Clone.jpg]() ![New_Filter_Spectrum_10-31-2022_small.jpg]()
|
Re: Alpha and Beta particle Spec
Explain this a bit I don’t
understand what you’re saying.
Dud
?
?
This one since the
beginning has its main peal showing at just above 3.5MeV
|
Re: Whatman filtercard clone.
Yep those gasket punches will do fine. Wish I had a sert. Do have indiviual ones that I need but no 1"
Say where's a good supplier to get a new Trane compatible AC Fan motor and all new2 AC capacitors for the condenser box outside? The motor is 220V, 1Ph, 1/3HP1 speed,1/2" fan bore shaft.WW94X328?
We got no Graingers' within 100 miles.? George?
George?
----- Original Message ----- From: Nick Andrews <nickjandrews@...> To: [email protected]Sent: Tue, 31 May 2022 10:37:43 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Whatman filtercard clone.
Sweet!? I want some.? I am thinking that gasket punch set I bought will be nice to make a clean hole in the paper material...
I'm flying up to OKC this afternoon, back Thursday.? Hope to be doing more testing this weekend.
On my Impex, using the Gast pump, it provides just the right amount of air the sensor wants.? I placed a piece of paper 1/2" from the pump's exhaust to check for oil fog emanating and after an hour there was no sign of anything on the white paper.? I think the glass bowl adequately traps any oil.? And yes, still running it on 120vac even though the motor nameplate reads 230.? All of these pumps I looked at on ebay and the mfr site refer to 120vac operation, so...
In remote outdoor air samplers, moving filters are the norm. This allows filter changing without an the sites. IMPEX has such a head, we don't have that, nor would I want that option. I do have some rolls of filter material from such a site, new, sealed in tin cans and further sealed in factory plastic bags That filter material is glass fiber on paper backing. What came in the Impex is similar but seems to have a mesh interlayer. Looking closely at the supplied filter there are pinholes present. A clone of the filter card was attempted. When used to replace the worn-out test filter as suppled, everything changed on the spectrum readout, for the better. We will of course consider using the OEM filters for serious work but these will be no cost playthings to gain experience. Now the PO peaks from Radon 222 daughters seem to be falling much more in line with predicted values. No other changes made. There are still other issues that need attending to, but those have been there since day 1, it's probably a matter of more training needed. PS if you request some of there be aware they have a textured? side which goes towards the sensor (i.e. UP). It covers a 25mm hole perfectly. The cards used here are double weight 3X5's because it's what I had. 4X6 would be better raw material, that size could simply be folded in half longways forming a 'book", trimmed to size using the original card as a template, the filter material secured inside and the edges taped shut It a pleasure to see the correct energy peaks from the Po species. I suggest printing the U-238 and Th-232 decay chains from the INL "Natural Decay Series: Uranium, Radium, and Thorium" and where it shows the alpha decays, pencil in the correct energy levels. This really helps not having to remember or look up what's what, If you don't have that link, it's also on my webpage K0FF@...PS Readings will be different on all instruments now, the weather has warmed, the widows screened,? open,? and an attic fan pumping fresh air in. It should prove interesting to retest everything, as the natural air should have far less Rn-222 present. A topic I would like to see discussed here is the broadening of the peaks, due to interaction of the Alpha Particles with matter (air). Geo Pics attached
|
New_Filter_Alpha_Spectrum_LOG
Under? VIEW, DISPLAY,?chose LOG and LINE Drawing. Here's a scan I can recognize. Also, photo of Rn-222 Alpha energies chart. Geo  
|
Re: Whatman filtercard clone.
Sweet!? I want some.? I am thinking that gasket punch set I bought will be nice to make a clean hole in the paper material...
I'm flying up to OKC this afternoon, back Thursday.? Hope to be doing more testing this weekend.
On my Impex, using the Gast pump, it provides just the right amount of air the sensor wants.? I placed a piece of paper 1/2" from the pump's exhaust to check for oil fog emanating and after an hour there was no sign of anything on the white paper.? I think the glass bowl adequately traps any oil.? And yes, still running it on 120vac even though the motor nameplate reads 230.? All of these pumps I looked at on ebay and the mfr site refer to 120vac operation, so...
In remote outdoor air samplers, moving filters are the norm. This allows filter changing without an the sites. IMPEX has such a head, we don't have that, nor would I want that option. I do have some rolls of filter material from such a site, new, sealed in tin cans and further sealed in factory plastic bags That filter material is glass fiber on paper backing. What came in the Impex is similar but seems to have a mesh interlayer. Looking closely at the supplied filter there are pinholes present. A clone of the filter card was attempted. When used to replace the worn-out test filter as suppled, everything changed on the spectrum readout, for the better. We will of course consider using the OEM filters for serious work but these will be no cost playthings to gain experience. Now the PO peaks from Radon 222 daughters seem to be falling much more in line with predicted values. No other changes made. There are still other issues that need attending to, but those have been there since day 1, it's probably a matter of more training needed. PS if you request some of there be aware they have a textured? side which goes towards the sensor (i.e. UP). It covers a 25mm hole perfectly. The cards used here are double weight 3X5's because it's what I had. 4X6 would be better raw material, that size could simply be folded in half longways forming a 'book", trimmed to size using the original card as a template, the filter material secured inside and the edges taped shut It a pleasure to see the correct energy peaks from the Po species. I suggest printing the U-238 and Th-232 decay chains from the INL "Natural Decay Series: Uranium, Radium, and Thorium" and where it shows the alpha decays, pencil in the correct energy levels. This really helps not having to remember or look up what's what, If you don't have that link, it's also on my webpage K0FF@...PS Readings will be different on all instruments now, the weather has warmed, the widows screened,? open,? and an attic fan pumping fresh air in. It should prove interesting to retest everything, as the natural air should have far less Rn-222 present. A topic I would like to see discussed here is the broadening of the peaks, due to interaction of the Alpha Particles with matter (air). Geo Pics attached  
|
Whatman filtercard clone.
In remote outdoor air samplers, moving filters are the norm. This allows filter changing without an operatord.to the sites. IMPEX has such a head, we don't have that, nor would I want that option. I do have some rolls of filter material from such a site, new, sealed in tin cans and further sealed in factory plastic bags That filter material is glass fiber on paper backing. What came in the Impex is similar but seems to have a mesh interlayer. Looking closely at the supplied filter there are pinholes present. A clone of the filter card was attempted. When used to replace the worn-out test filter as suppled, everything changed on the spectrum readout, for the better. We will of course consider using the OEM filters for serious work, but these will be no cost playthings to gain experience. Now the Polonium peaks from Radon 222 daughters seem to be falling much more in line with predicted values. No other changes made. There are still other issues that need attending to, but those have been there since day 1, it's probably a matter of more training needed. PS if you request some of there be aware they have a textured side which goes towards the sensor (i.e., UP). It covers a 25mm hole perfectly. The cards used here are double weight 3X5's because it's what I had. 4X6 would be better raw material, that size could simply be folded in half longways forming a 'book", trimmed to size using the original card as a template, the filter material secured inside, then the edges taped shut It a pleasure to see the correct energy peaks from the Po species! I suggest printing the U-238 and Th-232 decay chains from the INL "Natural Decay Series: Uranium, Radium, and Thorium" and where it shows the alpha decays, pencil in the correct energy levels. This really helps not having to remember or look up what's what, If you don't have that link, it's also on my webpage K0FF@...PS Readings will be different on all instruments now, the weather has warmed, the widows screened,? open,? and an attic fan pumping fresh air in. It should prove interesting to retest everything, as the natural air should have far less Rn-222 present. A topic I would like to see discussed here is the broadening of the peaks, due to interaction of the Alpha Particles with matter (air). Geo Pics attached  
|
Re: Alpha and Beta particle Spec
CRM--510 also logs temperature, relative humidity, and Barometric pressure against radon to correlate storm fronts and furnace cycling.
Geo
----- Original Message ----- From: Dude <dfemer@...> To: [email protected]Sent: Mon, 30 May 2022 23:28:51 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta particle Spec
?What is a ?CRM-510? How does
it measure the ?radon?. I hate to say it but if it’s off and in storage it’s
not sampling or measuring radon. Old last measurement maybe? Dud ? ? ? This thing connects to
Radnet too. Alan, I, Peter and others
are looking towards lab alpha spec with the Eberline 6A, WL meters? and
others incl. NIM. And other solid-state setups. Plugged in the CRM-510 in
same room with the IMPEX, within 10 minutes it was reading 2.4 pCi/L. But it never shuts off, the
ion chamber is on even in storage so, it's hot as soon as you activate the
electronics. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 16:51:43 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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Geo, to monitor for Thoron
set up the top window for Po-212 Acute and use a short time window. You could
also look at the raw cps Dud ? ? Geo, I’m looking for the
numbers – what was the flow rate and how long was it running when you took that
picture? Until you get another
filter I would not load that one up as it’ll take over 8 hrs to calm down due
to the Bi-212 I can only assume the
calculations will adjust for this but this unit is set up to monitor relatively
steady state Rn-222 as set up by the factory. How to switch it over to a user
defined and calibrated ROI type is a question we need answered by the factory.
Remember this is not a lab alpha spectrometer it’s a CAM. There are procedures
for source calibrating ROI’s in the manual. I would not change any ROI’s right
now that would be asking for trouble without more guidance. Dud ? ? Yes it has to run for a
good long time to get your stable reading, when first started pumping it reads
very low, orders of magnitude. NICK- ask this question of
your contact - what OTHER isotopes can it be calibrated to? Today I tried
changing the Regions of interested or shutting them off, but it wouldn't seem
to let that happen. I suspect we can block the Uranium generated radon from
alarming and just have the Thorium radon set it off? I think I'll let it smell
Thoron gas for a while and watch the spectrum. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 15:48:04 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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Geo, Yes 1.8 pCi/l you just
have to multiply the screen reading by 1000 to get Liters. How long was that run when
you took the picture, 53 min or so? and what was the flow rate ?0.87 l/m?
?That low radon count must be from a limestone bedrock or you opened a
window. Dud ? ? ? doesn't that work out to
1.8pCi/L? That's about right for
here, I think. Normal background Gamma is low here in particular because behind
the house is no ground, just air. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 13:32:55 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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Geo, You may have to
recalibrate the touch screen . Mine was very hard to get the monitor tab to
come up. There is a procedure in the manual that will allow you to fix the
touch
screen positions. I found using a soft pointed touch screen pen worked better
than fingers on that top bar.. Be careful not to scratch the screen with a hard
pointy pen. ? How long was that run when
you took the picture 53 min or so? and what was the flow rate ?0.87 l/m?
?That
low radon count must be from a limestone bedrock or you opened a window. Dud ? ? It took more time to
figure out you can't punch those buttons easily with FF (Fat Fingers) Tried
some tools and found something that worked AOK. Following your instructions was
easy (sort of, regular easy, like training a cat easy, not easy-peasy). Results are in line with
the other instruments now. Those have been taken in other rooms though, but
very close. Will set them all up in
same place and see for real.
|
Re: Alpha and Beta particle Spec
Look up Femtotech CRM-510
That's what I used to make those printed charts posted. Tracks the changes over time.
It is active even if off, of course it's not recording the data.
It's probably the standard of the industry for radon survey.
Geo
----- Original Message ----- From: Dude <dfemer@...> To: [email protected]Sent: Mon, 30 May 2022 23:28:51 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta particle Spec
?What is a ?CRM-510? How does
it measure the ?radon?. I hate to say it but if it’s off and in storage it’s
not sampling or measuring radon. Old last measurement maybe? Dud ? ? ? This thing connects to
Radnet too. Alan, I, Peter and others
are looking towards lab alpha spec with the Eberline 6A, WL meters? and
others incl. NIM. And other solid-state setups. Plugged in the CRM-510 in
same room with the IMPEX, within 10 minutes it was reading 2.4 pCi/L. But it never shuts off, the
ion chamber is on even in storage so, it's hot as soon as you activate the
electronics. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 16:51:43 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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/*]]>*/
Geo, to monitor for Thoron
set up the top window for Po-212 Acute and use a short time window. You could
also look at the raw cps Dud ? ? Geo, I’m looking for the
numbers – what was the flow rate and how long was it running when you took that
picture? Until you get another
filter I would not load that one up as it’ll take over 8 hrs to calm down due
to the Bi-212 I can only assume the
calculations will adjust for this but this unit is set up to monitor relatively
steady state Rn-222 as set up by the factory. How to switch it over to a user
defined and calibrated ROI type is a question we need answered by the factory.
Remember this is not a lab alpha spectrometer it’s a CAM. There are procedures
for source calibrating ROI’s in the manual. I would not change any ROI’s right
now that would be asking for trouble without more guidance. Dud ? ? Yes it has to run for a
good long time to get your stable reading, when first started pumping it reads
very low, orders of magnitude. NICK- ask this question of
your contact - what OTHER isotopes can it be calibrated to? Today I tried
changing the Regions of interested or shutting them off, but it wouldn't seem
to let that happen. I suspect we can block the Uranium generated radon from
alarming and just have the Thorium radon set it off? I think I'll let it smell
Thoron gas for a while and watch the spectrum. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 15:48:04 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
margin: 0.0in;
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/*]]>*/
Geo, Yes 1.8 pCi/l you just
have to multiply the screen reading by 1000 to get Liters. How long was that run when
you took the picture, 53 min or so? and what was the flow rate ?0.87 l/m?
?That low radon count must be from a limestone bedrock or you opened a
window. Dud ? ? ? doesn't that work out to
1.8pCi/L? That's about right for
here, I think. Normal background Gamma is low here in particular because behind
the house is no ground, just air. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 13:32:55 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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/*]]>*/
Geo, You may have to
recalibrate the touch screen . Mine was very hard to get the monitor tab to
come up. There is a procedure in the manual that will allow you to fix the
touch
screen positions. I found using a soft pointed touch screen pen worked better
than fingers on that top bar.. Be careful not to scratch the screen with a hard
pointy pen. ? How long was that run when
you took the picture 53 min or so? and what was the flow rate ?0.87 l/m?
?That
low radon count must be from a limestone bedrock or you opened a window. Dud ? ? It took more time to
figure out you can't punch those buttons easily with FF (Fat Fingers) Tried
some tools and found something that worked AOK. Following your instructions was
easy (sort of, regular easy, like training a cat easy, not easy-peasy). Results are in line with
the other instruments now. Those have been taken in other rooms though, but
very close. Will set them all up in
same place and see for real.
|
Re: Alpha and Beta particle Spec
This one since the beginning has its main peal showing at just above 3.5MeV
Geo
----- Original Message ----- From: Dude <dfemer@...> To: [email protected]Sent: Mon, 30 May 2022 23:14:30 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta particle Spec
Geo, It seems the cal card is whatever
disk you put there and set up in the cal routine. There also seems to be two
set ups that the Cam ?is programmed for, Radon and another type of set up for
other isotopes - actinides I don’t know if we can switch between them, this is
a question we need to put to the rep. I’ll try that tomorrow. Spectrum wise – with no
counts it displays up to 9..0 MeV, running Rn222 it see’s Po 212 at 8.784 MeV. ?What
Is yours running at – dark matter? Dud ? Have any idea what the
isotopes on their calibration cards is Dud? does your spectrum run at
~3500MeV? at the medium ROI> What's there as far as alpha decay? Flow rate just under 1
CFM. Time- don't know I let it run, go do chores, later come back Don't watch
the time. 3 of the Reuter Stokes
control boxes are RS1310 controllers, any ideas? Found 4 heads tho. Still
digging in the shed.Probably a mile of wire, coax, heliax CCTV hardline in
there. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 16:39:52 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec Geo, I’m looking for the
numbers – what was the flow rate and how long was it running when you took that
picture? Until you get another filter
I would not load that one up as it’ll take over 8 hrs to calm down due to the
Bi-212 I can only assume the
calculations will adjust for this but this unit is set up to monitor relatively
steady state Rn-222 as set up by the factory. How to switch it over to a user
defined
and calibrated ROI type is a question we need answered by the factory. Remember
this is not a lab alpha spectrometer it’s a CAM. There are procedures for
source
calibrating ROI’s in the manual. I would not change any ROI’s right now that
would be asking for trouble without more guidance. Dud ? ? Yes it has to run for a
good long time to get your stable reading, when first started pumping it reads
very low, orders of magnitude. NICK- ask this question of
your contact - what OTHER isotopes can it be calibrated to? Today I tried
changing
the Regions of interested or shutting them off, but it wouldn't seem to let
that happen. I suspect we can block the Uranium generated radon from alarming
and just have the Thorium radon set it off? I think I'll let it smell
Thoron gas for a while and watch the spectrum. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 15:48:04 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha
and Beta
particle Spec
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/*]]>*/ Geo, Yes 1.8 pCi/l you just
have to multiply the screen reading by 1000 to get Liters. How long was that run when
you took the picture, 53 min or so? and what was the flow rate
?0.87 l/m?
?That low radon count must be from a limestone bedrock or you
opened a
window. Dud ? ? ? doesn't that work out to
1.8pCi/L? That's about right for
here, I think. Normal background Gamma is low here in particular
because behind
the house is no ground, just air. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 13:32:55 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
margin: 0.0in;
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/*]]>*/
Geo, You may have to
recalibrate the touch screen . Mine was very hard to get the monitor tab to
come up. There is a procedure in the manual that will allow you to fix the
touch
screen positions. I found using a soft pointed touch screen pen worked better
than fingers on that top bar.. Be careful not to scratch the screen with a hard
pointy pen.
? How long was that run when
you took the picture 53 min or so? and what was the flow rate ?0.87 l/m?
?That
low radon count must be from a limestone bedrock or you opened a window.
Dud ? ? It took more time to
figure out you can't punch those buttons easily with FF (Fat Fingers) Tried
some tools and found something that worked AOK. Following your instructions was
easy (sort of, regular easy, like training a cat easy, not easy-peasy).
Results are in line with
the other instruments now. Those have been taken in other rooms though, but
very close.
Will set them all up in
same place and see for real.
|
Re: Alpha and Beta particle Spec
?What is a ?CRM-510? How does
it measure the ?radon?. I hate to say it but if it’s off and in storage it’s
not sampling or measuring radon. Old last measurement maybe?
Dud
?
?
?
This thing connects to
Radnet too.
Alan, I, Peter and others
are looking towards lab alpha spec with the Eberline 6A, WL meters? and
others incl. NIM. And other solid-state setups.
Plugged in the CRM-510 in
same room with the IMPEX, within 10 minutes it was reading 2.4 pCi/L.
But it never shuts off, the
ion chamber is on even in storage so, it's hot as soon as you activate the
electronics.
toggle quoted message
Show quoted text
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 16:51:43 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
margin: 0.0in;
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/*]]>*/
Geo, to monitor for Thoron
set up the top window for Po-212 Acute and use a short time window. You could
also look at the raw cps
Dud
?
?
Geo,
I’m looking for the
numbers – what was the flow rate and how long was it running when you took that
picture?
Until you get another
filter I would not load that one up as it’ll take over 8 hrs to calm down due
to the Bi-212
I can only assume the
calculations will adjust for this but this unit is set up to monitor relatively
steady state Rn-222 as set up by the factory. How to switch it over to a user
defined and calibrated ROI type is a question we need answered by the factory.
Remember this is not a lab alpha spectrometer it’s a CAM. There are procedures
for source calibrating ROI’s in the manual. I would not change any ROI’s right
now that would be asking for trouble without more guidance.
Dud
?
?
Yes it has to run for a
good long time to get your stable reading, when first started pumping it reads
very low, orders of magnitude.
NICK- ask this question of
your contact - what OTHER isotopes can it be calibrated to? Today I tried
changing the Regions of interested or shutting them off, but it wouldn't seem
to let that happen. I suspect we can block the Uranium generated radon from
alarming and just have the Thorium radon set it off?
I think I'll let it smell
Thoron gas for a while and watch the spectrum.
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 15:48:04 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
margin: 0.0in;
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/*]]>*/
Geo,
Yes 1.8 pCi/l you just
have to multiply the screen reading by 1000 to get Liters.
How long was that run when
you took the picture, 53 min or so? and what was the flow rate ?0.87 l/m?
?That low radon count must be from a limestone bedrock or you opened a
window.
Dud
?
?
?
doesn't that work out to
1.8pCi/L?
That's about right for
here, I think. Normal background Gamma is low here in particular because behind
the house is no ground, just air.
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 13:32:55 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
margin: 0.0in;
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/*]]>*/
Geo,
You may have to
recalibrate the touch screen . Mine was very hard to get the monitor tab to
come up. There is a procedure in the manual that will allow you to fix the
touch
screen positions. I found using a soft pointed touch screen pen worked better
than fingers on that top bar.. Be careful not to scratch the screen with a hard
pointy pen.
?
How long was that run when
you took the picture 53 min or so? and what was the flow rate ?0.87 l/m?
?That
low radon count must be from a limestone bedrock or you opened a window.
Dud
?
?
It took more time to
figure out you can't punch those buttons easily with FF (Fat Fingers) Tried
some tools and found something that worked AOK. Following your instructions was
easy (sort of, regular easy, like training a cat easy, not easy-peasy).
Results are in line with
the other instruments now. Those have been taken in other rooms though, but
very close.
Will set them all up in
same place and see for real.
|
Re: Alpha and Beta particle Spec
Geo,
It seems the cal card is whatever
disk you put there and set up in the cal routine. There also seems to be two
set ups that the Cam ?is programmed for, Radon and another type of set up for
other isotopes - actinides I don’t know if we can switch between them, this is
a question we need to put to the rep. I’ll try that tomorrow.
Spectrum wise – with no
counts it displays up to 9..0 MeV, running Rn222 it see’s Po 212 at 8.784 MeV. ?What
Is yours running at – dark matter?
Dud
?
Have any idea what the
isotopes on their calibration cards is Dud?
does your spectrum run at
~3500MeV? at the medium ROI> What's there as far as alpha decay?
Flow rate just under 1
CFM. Time- don't know I let it run, go do chores, later come back Don't watch
the time.
3 of the Reuter Stokes
control boxes are RS1310 controllers, any ideas? Found 4 heads tho. Still
digging in the shed.Probably a mile of wire, coax, heliax CCTV hardline in
there.
toggle quoted message
Show quoted text
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 16:39:52 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
Geo,
I’m looking for the
numbers – what was the flow rate and how long was it running when you took that
picture?
Until you get another filter
I would not load that one up as it’ll take over 8 hrs to calm down due to the
Bi-212
I can only assume the
calculations will adjust for this but this unit is set up to monitor relatively
steady state Rn-222 as set up by the factory. How to switch it over to a user
defined
and calibrated ROI type is a question we need answered by the factory. Remember
this is not a lab alpha spectrometer it’s a CAM. There are procedures for
source
calibrating ROI’s in the manual. I would not change any ROI’s right now that
would be asking for trouble without more guidance.
Dud
?
?
Yes it has to run for a
good long time to get your stable reading, when first started pumping it reads
very low, orders of magnitude.
NICK- ask this question of
your contact - what OTHER isotopes can it be calibrated to? Today I tried
changing
the Regions of interested or shutting them off, but it wouldn't seem to let
that happen. I suspect we can block the Uranium generated radon from alarming
and just have the Thorium radon set it off?
I think I'll let it smell
Thoron gas for a while and watch the spectrum.
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 15:48:04 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha
and Beta
particle Spec
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/*]]>*/
Geo,
Yes 1.8 pCi/l you just
have to multiply the screen reading by 1000 to get Liters.
How long was that run when
you took the picture, 53 min or so? and what was the flow rate
?0.87 l/m?
?That low radon count must be from a limestone bedrock or you
opened a
window.
Dud
?
?
?
doesn't that work out to
1.8pCi/L?
That's about right for
here, I think. Normal background Gamma is low here in particular
because behind
the house is no ground, just air.
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 13:32:55 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
margin: 0.0in;
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Geo,
You may have to
recalibrate the touch screen . Mine was very hard to get the monitor tab to
come up. There is a procedure in the manual that will allow you to fix the
touch
screen positions. I found using a soft pointed touch screen pen worked better
than fingers on that top bar.. Be careful not to scratch the screen with a hard
pointy pen.
?
How long was that run when
you took the picture 53 min or so? and what was the flow rate ?0.87 l/m?
?That
low radon count must be from a limestone bedrock or you opened a window.
Dud
?
?
It took more time to
figure out you can't punch those buttons easily with FF (Fat Fingers) Tried
some tools and found something that worked AOK. Following your instructions was
easy (sort of, regular easy, like training a cat easy, not easy-peasy).
Results are in line with
the other instruments now. Those have been taken in other rooms though, but
very close.
Will set them all up in
same place and see for real.
|
Re: Alpha and Beta particle Spec
-Po212 = zero cps.....
This thing connects to Radnet too.
Alan, I, Peter and others are looking towards lab alpha spec with the Eberline 6A, WL meters? and others incl. NIM. And other solid-state setups.
Plugged in the CRM-510 in same room with the IMPEX, within 10 minutes it was reading 2.4 pCi/L. But it never shuts off, the ion chamber is on even in storage so, it's hot as soon as you activate the electronics.
Geo
----- Original Message ----- From: Dude <dfemer@...> To: [email protected]Sent: Mon, 30 May 2022 16:51:43 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta particle Spec
Geo, to monitor for Thoron
set up the top window for Po-212 Acute and use a short time window. You could
also look at the raw cps Dud ? ? Geo, I’m looking for the
numbers – what was the flow rate and how long was it running when you took that
picture? Until you get another
filter I would not load that one up as it’ll take over 8 hrs to calm down due
to the Bi-212 I can only assume the
calculations will adjust for this but this unit is set up to monitor relatively
steady state Rn-222 as set up by the factory. How to switch it over to a user
defined and calibrated ROI type is a question we need answered by the factory.
Remember this is not a lab alpha spectrometer it’s a CAM. There are procedures
for source calibrating ROI’s in the manual. I would not change any ROI’s right
now that would be asking for trouble without more guidance. Dud ? ? Yes it has to run for a
good long time to get your stable reading, when first started pumping it reads
very low, orders of magnitude. NICK- ask this question of
your contact - what OTHER isotopes can it be calibrated to? Today I tried
changing the Regions of interested or shutting them off, but it wouldn't seem
to let that happen. I suspect we can block the Uranium generated radon from
alarming and just have the Thorium radon set it off? I think I'll let it smell
Thoron gas for a while and watch the spectrum. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 15:48:04 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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Geo, Yes 1.8 pCi/l you just
have to multiply the screen reading by 1000 to get Liters. How long was that run when
you took the picture, 53 min or so? and what was the flow rate ?0.87 l/m?
?That low radon count must be from a limestone bedrock or you opened a
window. Dud ? ? ? doesn't that work out to
1.8pCi/L? That's about right for
here, I think. Normal background Gamma is low here in particular because behind
the house is no ground, just air. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 13:32:55 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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Geo, You may have to
recalibrate the touch screen . Mine was very hard to get the monitor tab to
come up. There is a procedure in the manual that will allow you to fix the
touch
screen positions. I found using a soft pointed touch screen pen worked better
than fingers on that top bar.. Be careful not to scratch the screen with a hard
pointy pen. ? How long was that run when
you took the picture 53 min or so? and what was the flow rate ?0.87 l/m?
?That
low radon count must be from a limestone bedrock or you opened a window. Dud ? ? It took more time to
figure out you can't punch those buttons easily with FF (Fat Fingers) Tried
some tools and found something that worked AOK. Following your instructions was
easy (sort of, regular easy, like training a cat easy, not easy-peasy). Results are in line with
the other instruments now. Those have been taken in other rooms though, but
very close. Will set them all up in
same place and see for real.
|
Re: Alpha and Beta particle Spec
Have any idea what the isotopes on their calibration cards is Dud?
does your spectrum run at ~3500MeV? at the medium ROI> What's there as far as alpha decay?
Flow rate just under 1 CFM. Time- don't know I let it run, go do chores, later come back Don't watch the time. 3 of the Reuter Stokes control boxes are RS1310 controllers, any ideas? Found 4 heads tho. Still digging in the shed.Probably a mile of wire, coax, heliax CCTV hardline in there.
Geo
----- Original Message ----- From: Dude <dfemer@...> To: [email protected]Sent: Mon, 30 May 2022 16:39:52 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta particle Spec
Geo, I’m looking for the
numbers – what was the flow rate and how long was it running when you took that
picture? Until you get another filter
I would not load that one up as it’ll take over 8 hrs to calm down due to the
Bi-212 I can only assume the
calculations will adjust for this but this unit is set up to monitor relatively
steady state Rn-222 as set up by the factory. How to switch it over to a user defined
and calibrated ROI type is a question we need answered by the factory. Remember
this is not a lab alpha spectrometer it’s a CAM. There are procedures for source
calibrating ROI’s in the manual. I would not change any ROI’s right now that
would be asking for trouble without more guidance. Dud ? ? Yes it has to run for a
good long time to get your stable reading, when first started pumping it reads
very low, orders of magnitude. NICK- ask this question of
your contact - what OTHER isotopes can it be calibrated to? Today I tried changing
the Regions of interested or shutting them off, but it wouldn't seem to let
that happen. I suspect we can block the Uranium generated radon from alarming
and just have the Thorium radon set it off? I think I'll let it smell
Thoron gas for a while and watch the spectrum. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 15:48:04 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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/*]]>*/ Geo, Yes 1.8 pCi/l you just
have to multiply the screen reading by 1000 to get Liters. How long was that run when
you took the picture, 53 min or so? and what was the flow rate ?0.87 l/m?
?That low radon count must be from a limestone bedrock or you opened a
window. Dud ? ? ? doesn't that work out to
1.8pCi/L? That's about right for
here, I think. Normal background Gamma is low here in particular because behind
the house is no ground, just air. ----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 13:32:55 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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Geo, You may have to
recalibrate the touch screen . Mine was very hard to get the monitor tab to
come up. There is a procedure in the manual that will allow you to fix the
touch
screen positions. I found using a soft pointed touch screen pen worked better
than fingers on that top bar.. Be careful not to scratch the screen with a hard
pointy pen.
? How long was that run when
you took the picture 53 min or so? and what was the flow rate ?0.87 l/m?
?That
low radon count must be from a limestone bedrock or you opened a window.
Dud ? ? It took more time to
figure out you can't punch those buttons easily with FF (Fat Fingers) Tried
some tools and found something that worked AOK. Following your instructions was
easy (sort of, regular easy, like training a cat easy, not easy-peasy).
Results are in line with
the other instruments now. Those have been taken in other rooms though, but
very close.
Will set them all up in
same place and see for real.
|
Re: Alpha and Beta particle Spec
Geo, to monitor for Thoron
set up the top window for Po-212 Acute and use a short time window. You could
also look at the raw cps
Dud
?
?
Geo,
I’m looking for the
numbers – what was the flow rate and how long was it running when you took that
picture?
Until you get another
filter I would not load that one up as it’ll take over 8 hrs to calm down due
to the Bi-212
I can only assume the
calculations will adjust for this but this unit is set up to monitor relatively
steady state Rn-222 as set up by the factory. How to switch it over to a user
defined and calibrated ROI type is a question we need answered by the factory.
Remember this is not a lab alpha spectrometer it’s a CAM. There are procedures
for source calibrating ROI’s in the manual. I would not change any ROI’s right
now that would be asking for trouble without more guidance.
Dud
?
?
Yes it has to run for a
good long time to get your stable reading, when first started pumping it reads
very low, orders of magnitude.
NICK- ask this question of
your contact - what OTHER isotopes can it be calibrated to? Today I tried
changing the Regions of interested or shutting them off, but it wouldn't seem
to let that happen. I suspect we can block the Uranium generated radon from
alarming and just have the Thorium radon set it off?
I think I'll let it smell
Thoron gas for a while and watch the spectrum.
toggle quoted message
Show quoted text
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 15:48:04 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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/*]]>*/
Geo,
Yes 1.8 pCi/l you just
have to multiply the screen reading by 1000 to get Liters.
How long was that run when
you took the picture, 53 min or so? and what was the flow rate ?0.87 l/m?
?That low radon count must be from a limestone bedrock or you opened a
window.
Dud
?
?
?
doesn't that work out to
1.8pCi/L?
That's about right for
here, I think. Normal background Gamma is low here in particular because behind
the house is no ground, just air.
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Mon, 30 May 2022 13:32:55 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. Alpha and Beta
particle Spec
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/*]]>*/
Geo,
You may have to
recalibrate the touch screen . Mine was very hard to get the monitor tab to
come up. There is a procedure in the manual that will allow you to fix the
touch
screen positions. I found using a soft pointed touch screen pen worked better
than fingers on that top bar.. Be careful not to scratch the screen with a hard
pointy pen.
?
How long was that run when
you took the picture 53 min or so? and what was the flow rate ?0.87 l/m?
?That
low radon count must be from a limestone bedrock or you opened a window.
Dud
?
?
It took more time to
figure out you can't punch those buttons easily with FF (Fat Fingers) Tried
some tools and found something that worked AOK. Following your instructions was
easy (sort of, regular easy, like training a cat easy, not easy-peasy).
Results are in line with
the other instruments now. Those have been taken in other rooms though, but
very close.
Will set them all up in
same place and see for real.
|
Nick Andrews
