Re: FOCUS: Air Filters for Radiation Detection
That¡¯s not going to be
much good for alpha a 1 to 5 um would be best
Dud
?
?
Found another reel, this one is probably for prefilter of air, or for
water, Whatman grade 41, 3-5/8" wide by 83m. part # 1441 6229
Best I can find out it's 20 um.
Geo
|
Re: FOCUS: Air Filters for Radiation Detection
Found another reel, this one is probably for prefilter of air, or for water, Whatman grade 41, 3-5/8" wide by 83m. part # 1441 6229
Best I can find out it's 20 um.
Geo
|
Re: FOCUS: Air Filters for Radiation Detection
Great Dudley, save a filter holder for me.
George
----- Original Message ----- From: Dude <dfemer@...> To: [email protected]Sent: Fri, 10 Jun 2022 22:36:22 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. FOCUS: Air Filters for Radiation Detection
I¡¯ve been searching for
air sampling filters for alpha spec, radon grab sampling and CAM use. It seems the
most popular and cheapest is the glass fiber type as opposed to the PTFE which
is very expensive. Attached is Hi-Q fact
sheet on GF filters. I did find a cheap set of PTFE type from china that I
ordered and will test out to see how good or bad the tails are compared to the
GF ones. https://www.ebay.com/itm/265557143381?hash=item3dd4706f55:g:9uEAAOSwNiZiEOWR I also have some Hi-Q Environmental
RVPH-25 47mm air sample filter holders if anyone needs one for radon grab
sampling. Dud ? roups.io Links: You
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[dfemer@...]
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From: Alan Jose <Alan.Jose@...>
To: geoelectronics@...
Sent: Fri, 10 Jun 2022 22:07:01 -0400 (EDT)
Subject: This Weekend
"This weekend I plan on getting in plenty of lab time. We¡¯ll see.
Alan"
Good Alan. If you set up the IMPEX, and want to remove the filter card, be sure to ask me or read the instructions how th release it by rotating that lever- pull out the locking pin, rotate that lever as far as it will go, that releases the clamping mechanism so the filter can go in and out without damage. I messed up my filter before understanding that, but already have new filters coming from China.
George
|
Re: FOCUS: Air Filters for Radiation Detection
I¡¯ve been searching for
air sampling filters for alpha spec, radon grab sampling and CAM use. It seems the
most popular and cheapest is the glass fiber type as opposed to the PTFE which
is very expensive.
Attached is Hi-Q fact
sheet on GF filters. I did find a cheap set of PTFE type from china that I
ordered and will test out to see how good or bad the tails are compared to the
GF ones.
https://www.ebay.com/itm/265557143381?hash=item3dd4706f55:g:9uEAAOSwNiZiEOWR
I also have some Hi-Q Environmental
RVPH-25 47mm air sample filter holders if anyone needs one for radon grab
sampling.
Dud
?
roups.io Links:
You
receive all messages sent to this group.
View/Reply
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Your
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[dfemer@...]
|
FOCUS: Air Filters for Radiation Detection
Let's use this thread to concentrate the air filter material, research, links and trials
If you make a post that's part of another thread, try to condense the filter related items here also when convenient. This will help newcomers' (and forgetful old-timers) a place to catch up on our work, discoveries and idea evolution.
Geo
|
"I'll have to check out Prutchi.? Has anyone bought his book?:? I should have a signed copy in the library, and will find it when the stacks come upstairs to be sold on eBay. Not all but most.
Geo
----- Original Message ----- From: Nick Andrews <nickjandrews@...> To: [email protected]Sent: Fri, 03 Jun 2022 10:15:24 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Eberline RM units
I'll have to check out Prutchi.? Has anyone bought his book?
I saw the value in these in the sensor more than anything else, which is why I kept them versus tossing on ebay for a C note or something.? Based on what I know now, I'd be kicking myself if I had!
No on the unit but I have that sensor in mt solid-state sensor collection. I see the PCB has a discriminator setting, but maybe the best approach to these surplus heads is to keep the sensor and charge coupled preamp, and substitute the electronics with a modular shaper block, then send that to a stand alone MCA.
For example the AMPTEK 8000D. It's set up for only external preamp/shaper heads already.
Later I'll show some of the CC preamp/shaper modules etc.
Also in my collection are flexible .s.s vacuum pipe for the small 25mm couplers, a manifold and electric-over-air relays.
And anything Dr. Prutchi used in his article is mine.
Geo
----- Original Message ----- From: Nick Andrews < nickjandrews@...> To: [email protected]Sent: Thu, 02 Jun 2022 21:42:50 -0400 (EDT) Subject: Alpha and Beta particle nuclear decay studies. Eberline RM units
So anybody seen these or know about them?? ?I got two of the sample units but no controller.?
|
Same here nick. Probably have a dozen solid state sensors or so that way. 3 I are still? in working Pylon WLx radon meters. Saved for a rainy day. Others came from units I scrapped ou already? but saved the pumps, valves, fittings, filter holders? and piping stuff\.
Geo
----- Original Message ----- From: Nick Andrews <nickjandrews@...> To: [email protected]Sent: Fri, 03 Jun 2022 10:15:24 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Eberline RM units
I'll have to check out Prutchi.? Has anyone bought his book?
I saw the value in these in the sensor more than anything else, which is why I kept them versus tossing on ebay for a C note or something.? Based on what I know now, I'd be kicking myself if I had!
No on the unit but I have that sensor in mt solid-state sensor collection. I see the PCB has a discriminator setting, but maybe the best approach to these surplus heads is to keep the sensor and charge coupled preamp, and substitute the electronics with a modular shaper block, then send that to a stand alone MCA.
For example the AMPTEK 8000D. It's set up for only external preamp/shaper heads already.
Later I'll show some of the CC preamp/shaper modules etc.
Also in my collection are flexible .s.s vacuum pipe for the small 25mm couplers, a manifold and electric-over-air relays.
And anything Dr. Prutchi used in his article is mine.
Geo
----- Original Message ----- From: Nick Andrews < nickjandrews@...> To: [email protected]Sent: Thu, 02 Jun 2022 21:42:50 -0400 (EDT) Subject: Alpha and Beta particle nuclear decay studies. Eberline RM units
So anybody seen these or know about them?? ?I got two of the sample units but no controller.?
|
I'll have to check out Prutchi.? Has anyone bought his book?
I saw the value in these in the sensor more than anything else, which is why I kept them versus tossing on ebay for a C note or something.? Based on what I know now, I'd be kicking myself if I had!
No on the unit but I have that sensor in mt solid-state sensor collection. I see the PCB has a discriminator setting, but maybe the best approach to these surplus heads is to keep the sensor and charge coupled preamp, and substitute the electronics with a modular shaper block, then send that to a stand alone MCA.
For example the AMPTEK 8000D. It's set up for only external preamp/shaper heads already.
Later I'll show some of the CC preamp/shaper modules etc.
Also in my collection are flexible .s.s vacuum pipe for the small 25mm couplers, a manifold and electric-over-air relays.
And anything Dr. Prutchi used in his article is mine.
Geo
----- Original Message ----- From: Nick Andrews < nickjandrews@...> To: [email protected]Sent: Thu, 02 Jun 2022 21:42:50 -0400 (EDT) Subject: Alpha and Beta particle nuclear decay studies. Eberline RM units
So anybody seen these or know about them?? ?I got two of the sample units but no controller.?
|
"Charge Sensitive" / "Charge Coupled (C.C)" "Transimpedance" / "FET Input" Preamplifier and Shaping Amplifier units
Most radiation detector sensors, except Geiger Muller tubes, require a preamplifier to boost their weak signals to a level a Multi-Channel-Analyzer can deal with and display the familiar histograms we use for energy (MCA) or time?studies (MCS or Multi-Channel-Scaler mode). This stage also acts as a buffer to convert the high impedance pulses from the sensor to drive a low impedance stage, perhaps a coaxial cable or some conventional electronic stage (bipolar transistor or IC). After the preamplifier, which is most often located in the sensor package, is a shaping amplifier. That stage shapes the raw pulses of the sensor into something that the following stages can recognize. With solid state sensors, this is often a triangular wave shape, and the shaping amplifier may be located within the sensor package as well. The various terms in the topic title are all the same item, just different names. FET input stages have been around for a very long time. If you've used an Eberline bench instrument, chances are it has a FET input. So do base mounted preamps for NaI(Tl) detectors, such as all the Canberra 12 and 14 plug on bases for Bicron scintillators etc. Rather than use some sort of homebrew setup, these first two stages can be purchased cheaply as LSI (Large Scale Integration) modules from several different manufacturers. From the same source, there are prewired PCB's to hold the modules and provide rudimentary functions such as power line bypass capacitors, input/ output terminals or connecters and any filtering needed on the power lines.? Cremat is one mfg. that has very reasonable prices, suitable for the amateur experimenter's Home Lab, or Physics Class demonstrations. Using this approach, a customized package for various different sensors can be assembled at low cost. Pics are of the C.C. Preamp and Shaping Amp boxes Dr. Pruitchi used in his article on introductory Alpha Spec. Geo   
|
WLM = Working Level Meter (or Monitor). It outputs a number which is called the Working Level. A common term used in radon monitoring,
We can most likely get a manual if we don't have it already.
Geo
----- Original Message ----- From: Nick Andrews <nickjandrews@...> To: [email protected]Sent: Thu, 02 Jun 2022 21:51:08 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. Eberline RM units
On Thu, Jun 2, 2022, 8:43 PM Nick Andrews via <nickjandrews= [email protected]> wrote: So anybody seen these or know about them?? ?I got two of the sample units but no controller.?
|
No on the unit but I have that sensor in mt solid-state sensor collection. I see the PCB has a discriminator setting, but maybe the best approach to these surplus heads is to keep the sensor and charge coupled preamp, and substitute the electronics with a modular shaper block, then send that to a stand alone MCA.
For example the AMPTEK 8000D. It's set up for only external preamp/shaper heads already.
Later I'll show some of the CC preamp/shaper modules etc.
Also in my collection are flexible .s.s vacuum pipe for the small 25mm couplers, a manifold and electric-over-air relays.
And anything Dr. Prutchi used in his article is mine.
Geo
----- Original Message ----- From: Nick Andrews <nickjandrews@...> To: [email protected]Sent: Thu, 02 Jun 2022 21:42:50 -0400 (EDT) Subject: Alpha and Beta particle nuclear decay studies. Eberline RM units
So anybody seen these or know about them?? ?I got two of the sample units but no controller.?
|
No, all I got was the two sensor heads.? They were on a pallet of gear I bought at auction from NMSU.? Mostly Ludlum stuff but these were there and I thought they might be useful so i kept them...
On Thu, Jun 2, 2022, 10:02 PM Dude < dfemer@...> wrote:
Its an Eberline radon working
level meter. Basically a CAM. The detector faces the filter and counts alphas. Do
you have a picture of the face of the instrumented. Does it look like this
patents
Dud
?
?
So anybody seen these or know about them?? ?I got two of the
sample units but no controller.?
|
Its an Eberline radon working
level meter. Basically a CAM. The detector faces the filter and counts alphas. Do
you have a picture of the face of the instrumented. Does it look like this
https://www.ebay.com/itm/224877324911
patents
https://patents.google.com/patent/US4920263A/ru
Dud
?
?
So anybody seen these or know about them?? ?I got two of the
sample units but no controller.?
|
On Thu, Jun 2, 2022, 8:43 PM Nick Andrews via <nickjandrews= [email protected]> wrote: So anybody seen these or know about them?? ?I got two of the sample units but no controller.?
|
So anybody seen these or know about them?? ?I got two of the sample units but no controller.?
|
what sort of pore size are we talking about ??
Just curious.
Only thing with pores I normally see/have is gortex rain clothes
or may be the membrane from my RO water filter ?
?
P
|
The milipore are just 1¡±
disks and high cost ptfe. Mirion and Jeff will be carded filters. Let¡¯s see
what they come up with on cost. Or maybe Geo can mass produce some cards we can
fit filters in.
Dud
?
?
Me too Dud but on a
smaller scale.
toggle quoted message
Show quoted text
----- Original Message
-----
From: Nick Andrews <nickjandrews@...>
To: [email protected]
Sent: Wed, 01 Jun 2022 11:51:52 -0400 (EDT)
Subject: Re: Alpha and Beta particle nuclear decay studies. CAM filters
Oof, not cheap but still doable.? I'd go in on them with
you.?
On Tue, May 31, 2022, 5:29
PM Dude <dfemer@...>
wrote:
Here¡¯s some background on filter cards
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
?
?
|
Me too Dud but on a smaller scale.
Geo
----- Original Message ----- From: Nick Andrews <nickjandrews@...> To: [email protected]Sent: Wed, 01 Jun 2022 11:51:52 -0400 (EDT) Subject: Re: Alpha and Beta particle nuclear decay studies. CAM filters
Oof, not cheap but still doable.? I'd go in on them with you.? On Tue, May 31, 2022, 5:29 PM Dude < dfemer@...> wrote: Here¡¯s some background on filter cards
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
|
Oof, not cheap but still doable.? I'd go in on them with you.?
On Tue, May 31, 2022, 5:29 PM Dude < dfemer@...> wrote:
Here¡¯s some background on filter cards
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
|
Nick Andrews
