When this group is out of memory, move to XRF-Page-2
We'll try to limit the size of our picture posts, and try to NOT repost pictures in your replies. Also without the WIKI, we may get along fine.
your host,
George Dowell
Geo
Group Email Addresses
|
Hi guys Ludlum 12S??is??my favorite. Yes the readings are not accurate. Actually for low energy x rays ,they overestimate due to energy response curve calibrated to Cs137,advantageous for me. Remember long time I tested??it out outside a??fluoroscopy room lead??glass It was going maybe thrice the bg rate which is not high. Subsequently the hospital used a??ion chamber??( used in??radiotherapy )? This was negative? Now back to my Ludlum? I placed??it close to my shielded xray tube and the it went off scale .alarming! I repeated behind my shielding stuff in the room and it moved a little? Outside at some distance it stopped
Taray?
On Saturday, February 13, 2021, 7:36 AM, Dude <dfemer@...> wrote:
Geo,
1 frustrating week of
trying to get a 30L dewar to fill a BEGE detector. Only got 3 psi and it would
drop to zero ?on trying to fill the detector. Had a bad dip stick seal in one
withdrawal device and on another I had to modify a 2¡± rubber seal to accommodate
a 2.5¡± 30 L dewar. (bicycle tire tube worked) ?By the time I got the 5 L BigMac
detector dewar filled and testing the hold time (4.9 days) ?I was out of LN2
limiting me to a couple of test shots. I ordered a 2.5¡± replacement neck seal and
a another dip stick so I will now have 2 30L¡¯s available. I was setting up a
broad energy HPGe detector and now modeling some geometries for calibrates. When
I finish the models I¡¯ll see if I can post the results.
BTW LN2 is cheap - $28 for
30L at the University.
Dud
?
Hey Dud, how did the Ln2
project go? Got some results to post?
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Fri, 12 Feb 2021 14:51:07 -0500 (EST)
Subject: Re: [XRF] Xrf coffee ground
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No, the 12S is not a good
instrument for that application. It only reads dose rate correctly when
calibrated for Cs-137. All other energies are wrong. The proper instrument
would be a Ludlum 17 measuring dose rate with a flat energy response over the
entire energy range of the X-ray tube. An x-ray tube is not a monochromatic
source
like Cs-137It has a broad energy spectrum resulting in an integrated energy
dose rate.
The 12s is my main go to
prospecting, checking for low level activity, general high sensitivity
detector,
but it¡¯s not a measure it for health protection type instrument
Don¡¯t kid yourself as to
what you think you¡¯re looking at ¨C measure it correctly, the 12S doesn¡¯t it
just tells you the tube is on.
Dud
?
?
On Fri, Feb 12, 2021 at 10:26 AM, taray singh wrote:
Radiation monitor Ludlum 12S meter?
For DETECTING the Ludlum12S is hard to beat, and is a good instrument for your
application.?
I used a similar instrument to track down a defective industrial X-Ray machine
at a factory in an industrial park.
The rays were so strong and non-directional they could be detected at a
distance of about 1 mile, then only stopped because the terrain went over a
hill.
Inside the industrial park, there was no directivity due to the strength, but
the Ludlum still gave a reading (full scale all ranges). The rays literally
filled the entire industrial park. Even when inside the offending factory, the
Ludlum scintillator still gave readings just as it should. I reported the
problem to the factory head and he shut down the machine. We saved some lives
that day I have no doubt. When I reported the incident to the State
Authorities, they said. OH THEM! We had trouble with THEM before.
The VALUE of those readings is not correct, so to MEASURE needs a different
instrument (which I have) , but the 12S will DETECT, no problem.?
Same cannot be said of any actual Geiger Counter. GM sensors will shut off
(saturate) in a high field. Go to ZERO in cheap meters, others like Ludlum
monitor for that and turn on an alarm. In no case can a GC be used to measure
beams.
Geo
|
Geo,
1 frustrating week of
trying to get a 30L dewar to fill a BEGE detector. Only got 3 psi and it would
drop to zero ?on trying to fill the detector. Had a bad dip stick seal in one
withdrawal device and on another I had to modify a 2¡± rubber seal to accommodate
a 2.5¡± 30 L dewar. (bicycle tire tube worked) ?By the time I got the 5 L BigMac
detector dewar filled and testing the hold time (4.9 days) ?I was out of LN2
limiting me to a couple of test shots. I ordered a 2.5¡± replacement neck seal and
a another dip stick so I will now have 2 30L¡¯s available. I was setting up a
broad energy HPGe detector and now modeling some geometries for calibrates. When
I finish the models I¡¯ll see if I can post the results.
BTW LN2 is cheap - $28 for
30L at the University.
Dud
?
Hey Dud, how did the Ln2
project go? Got some results to post?
toggle quoted message
Show quoted text
----- Original Message
-----
From: Dude <dfemer@...>
To: [email protected]
Sent: Fri, 12 Feb 2021 14:51:07 -0500 (EST)
Subject: Re: [XRF] Xrf coffee ground
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No, the 12S is not a good
instrument for that application. It only reads dose rate correctly when
calibrated for Cs-137. All other energies are wrong. The proper instrument
would be a Ludlum 17 measuring dose rate with a flat energy response over the
entire energy range of the X-ray tube. An x-ray tube is not a monochromatic
source
like Cs-137It has a broad energy spectrum resulting in an integrated energy
dose rate.
The 12s is my main go to
prospecting, checking for low level activity, general high sensitivity
detector,
but it¡¯s not a measure it for health protection type instrument
Don¡¯t kid yourself as to
what you think you¡¯re looking at ¨C measure it correctly, the 12S doesn¡¯t it
just tells you the tube is on.
Dud
?
?
On Fri, Feb 12, 2021 at 10:26 AM, taray singh wrote:
Radiation monitor Ludlum 12S meter?
For DETECTING the Ludlum12S is hard to beat, and is a good instrument for your
application.?
I used a similar instrument to track down a defective industrial X-Ray machine
at a factory in an industrial park.
The rays were so strong and non-directional they could be detected at a
distance of about 1 mile, then only stopped because the terrain went over a
hill.
Inside the industrial park, there was no directivity due to the strength, but
the Ludlum still gave a reading (full scale all ranges). The rays literally
filled the entire industrial park. Even when inside the offending factory, the
Ludlum scintillator still gave readings just as it should. I reported the
problem to the factory head and he shut down the machine. We saved some lives
that day I have no doubt. When I reported the incident to the State
Authorities, they said. OH THEM! We had trouble with THEM before.
The VALUE of those readings is not correct, so to MEASURE needs a different
instrument (which I have) , but the 12S will DETECT, no problem.?
Same cannot be said of any actual Geiger Counter. GM sensors will shut off
(saturate) in a high field. Go to ZERO in cheap meters, others like Ludlum
monitor for that and turn on an alarm. In no case can a GC be used to measure
beams.
Geo
|
Hey Dud, how did the Ln2 project go? Got some results to post?
Geo
----- Original Message ----- From: Dude <dfemer@...> To: [email protected]Sent: Fri, 12 Feb 2021 14:51:07 -0500 (EST) Subject: Re: [XRF] Xrf coffee ground
No, the 12S is not a good
instrument for that application. It only reads dose rate correctly when
calibrated for Cs-137. All other energies are wrong. The proper instrument
would be a Ludlum 17 measuring dose rate with a flat energy response over the
entire energy range of the X-ray tube. An x-ray tube is not a monochromatic source
like Cs-137It has a broad energy spectrum resulting in an integrated energy
dose rate. The 12s is my main go to
prospecting, checking for low level activity, general high sensitivity detector,
but it¡¯s not a measure it for health protection type instrument Don¡¯t kid yourself as to
what you think you¡¯re looking at ¨C measure it correctly, the 12S doesn¡¯t it
just tells you the tube is on. Dud ? ? On Fri, Feb 12, 2021 at 10:26 AM, taray singh wrote: Radiation monitor Ludlum 12S meter?
For DETECTING the Ludlum12S is hard to beat, and is a good instrument for your
application.?
I used a similar instrument to track down a defective industrial X-Ray machine
at a factory in an industrial park.
The rays were so strong and non-directional they could be detected at a
distance of about 1 mile, then only stopped because the terrain went over a
hill.
Inside the industrial park, there was no directivity due to the strength, but
the Ludlum still gave a reading (full scale all ranges). The rays literally
filled the entire industrial park. Even when inside the offending factory, the
Ludlum scintillator still gave readings just as it should. I reported the
problem to the factory head and he shut down the machine. We saved some lives
that day I have no doubt. When I reported the incident to the State
Authorities, they said. OH THEM! We had trouble with THEM before.
The VALUE of those readings is not correct, so to MEASURE needs a different
instrument (which I have) , but the 12S will DETECT, no problem.?
Same cannot be said of any actual Geiger Counter. GM sensors will shut off
(saturate) in a high field. Go to ZERO in cheap meters, others like Ludlum
monitor for that and turn on an alarm. In no case can a GC be used to measure
beams.
Geo
|
No, the 12S is not a good
instrument for that application. It only reads dose rate correctly when
calibrated for Cs-137. All other energies are wrong. The proper instrument
would be a Ludlum 17 measuring dose rate with a flat energy response over the
entire energy range of the X-ray tube. An x-ray tube is not a monochromatic source
like Cs-137It has a broad energy spectrum resulting in an integrated energy
dose rate.
The 12s is my main go to
prospecting, checking for low level activity, general high sensitivity detector,
but it¡¯s not a measure it for health protection type instrument
Don¡¯t kid yourself as to
what you think you¡¯re looking at ¨C measure it correctly, the 12S doesn¡¯t it
just tells you the tube is on.
Dud
?
?
toggle quoted message
Show quoted text
On Fri, Feb 12, 2021 at 10:26 AM, taray singh wrote:
Radiation monitor Ludlum 12S meter?
For DETECTING the Ludlum12S is hard to beat, and is a good instrument for your
application.?
I used a similar instrument to track down a defective industrial X-Ray machine
at a factory in an industrial park.
The rays were so strong and non-directional they could be detected at a
distance of about 1 mile, then only stopped because the terrain went over a
hill.
Inside the industrial park, there was no directivity due to the strength, but
the Ludlum still gave a reading (full scale all ranges). The rays literally
filled the entire industrial park. Even when inside the offending factory, the
Ludlum scintillator still gave readings just as it should. I reported the
problem to the factory head and he shut down the machine. We saved some lives
that day I have no doubt. When I reported the incident to the State
Authorities, they said. OH THEM! We had trouble with THEM before.
The VALUE of those readings is not correct, so to MEASURE needs a different
instrument (which I have) , but the 12S will DETECT, no problem.?
Same cannot be said of any actual Geiger Counter. GM sensors will shut off
(saturate) in a high field. Go to ZERO in cheap meters, others like Ludlum
monitor for that and turn on an alarm. In no case can a GC be used to measure
beams.
Geo
|
On Fri, Feb 12, 2021 at 10:26 AM, taray singh wrote:
Radiation monitor Ludlum 12S meter?
For DETECTING the Ludlum12S is hard to beat, and is a good instrument for your application.? I used a similar instrument to track down a defective industrial X-Ray machine at a factory in an industrial park. The rays were so strong and non-directional they could be detected at a distance of about 1 mile, then only stopped because the terrain went over a hill. Inside the industrial park, there was no directivity due to the strength, but the Ludlum still gave a reading (full scale all ranges). The rays literally filled the entire industrial park. Even when inside the offending factory, the Ludlum scintillator still gave readings just as it should. I reported the problem to the factory head and he shut down the machine. We saved some lives that day I have no doubt. When I reported the incident to the State Authorities, they said. OH THEM! We had trouble with THEM before. The VALUE of those readings is not correct, so to MEASURE needs a different instrument (which I have) , but the 12S will DETECT, no problem.? Same cannot be said of any actual Geiger Counter. GM sensors will shut off (saturate) in a high field. Go to ZERO in cheap meters, others like Ludlum monitor for that and turn on an alarm. In no case can a GC be used to measure beams. Geo
|
Taray,
Be careful with X-ray
tubes as they have a very broad energy range with a very high dose rate. The
Ludlum12s is not an appropriate instrument to measure the dose rate with as its
response is energy dependent. You would need an ion chamber type instrument
that will read flat over a large energy range from 20 keV up. ?
What X-Ray tube are you
using and what beam current?
I may never drink coffee
again. I¡¯ll have a look at my coffee and see what it looks like
Dud
?
Geo
My remote has got a short antenna.
Covers quite a distance and no need ?for?eye contact?
I dunno much ?about it?but not definitely not infrared?
The inverse square law together with the existing shielding within the
room should be enough.
Radiation monitor Ludlum 12S meter?
toggle quoted message
Show quoted text
On Friday,
February 12, 2021, 11:31 PM, GEOelectronics@... wrote:
Tube tech is simple. The
beam is combination of Bremsstrahlung X-Rays from the electron beam stopping on
the target and XRF from the tungsten (or other target) caused by the electron
stream. Same Ka and Kb and La and Lb as we use. Notice in my tungsten target
tube, the W La and Lb are filtered out internally and on purpose.
With Bremstrahhlung, the
emitted energy starts at zero and goes up to the highest accelerating Voltage
appled, but the bulf of the generated energy will be at 1/3 of that peak V.
From: "taray singh via
groups.io" <sukhjez@...>
To: [email protected]
Sent: Friday, February 12, 2021
9:08:06 AM
Subject: Re: [XRF] Xrf coffee
ground
Geo
Unlike
Am241,I am not familiar with the X-ray xrf??spectrum
yet
Yes I
will stack if I have to go beyond 3 secs to cool off.
Regarding
Br ,it is coming ?likely?from the coffee
The
clear??colorless thin kitchen wrap??is not
contributing??to??bromine
Anything
with Br will probably??have a??darker
shade in my opinion?
Yes I
will??keep a file
My ALARA
is inverse square law
Get out
of the room??and use
remote control??to
trigger X-ray at a safe distance?
There
will be ringing sound until completion
Seems to
work
Scatter
within room will always be there?
Thanks
?
On Friday, February 12, 2021, 10:17 PM,
GEOelectronics@... wrote:
Thanks for that analysis
Taray. We should keep quite about the free vitamins that are unknowingly being
included in coffee, they will raise the price!(joke).
We can see clearly on your
scan the internal filtering and physics of the beam. Notice the
"hump" on? the right right side above 20 keV.?
Scan the kitchen wrap
alone to establish baseline. Maybe a compressed ball of it. Keep that file, it
can be subtracted from scans of actual samples
Think about
"stacking". This is when the beam needs to be cooled off between
scans or the scan needs to be interrupted. Pause the Si-PIN from counting until
the beam is ready again, then start it up and apply beam. If the setup is
unchanged, the peaks of interest will stack up on top of the previous ones.
From: "taray singh via
groups.io" <sukhjez@...>
To: [email protected]
Sent: Friday, February 12, 2021
4:04:13 AM
Subject: Re: [XRF] Xrf coffee
ground
Hi guys
No analysis is complete without a control
Here is an xrf of the? same fresh coffee beans (partly crushed to make it
more homogenous)
Wrapped in a thin kitchen plastic sheet.
In line with the higher count rate,peaking time? increased to 32.
Xray exposure 3 secs
?This time peaks are seen more clearly
This is partly due to the hot water scavenging effect? of the coffee
beans? by the coffee maker? releasing ingredients into the cup.
This time peaks noted are Fe,Ni ,Br and Rb plus Pb
Pb is probably due to residual contamination?
Rb is obvious this time
Brazilian coffee is well known for this.
Mine is Vietnamese
Bromine is something unexpected
.It?could be? due to bromine pesticides used in the plantation.
Looks like I? cannot find any faults in Nescafe Milano? coffee maker
used in my office
But I will not drink the coffee
Coffee fresh? mca attached.
Taray
?
|
Tube tech is simple. The beam is combination of Bremsstrahlung X-Rays from the electron beam stopping on the target and XRF from the tungsten (or other target) caused by the electron stream. Same Ka and Kb and La and Lb as we use. Notice in my tungsten target tube, the W La and Lb are filtered out internally and on purpose.
With Bremstrahhlung, the emitted energy starts at zero and goes up to the highest accelerating Voltage appled, but the bulf of the generated energy will be at 1/3 of that peak V.
Geo
From: "taray singh via groups.io" <sukhjez@...> To: [email protected]Sent: Friday, February 12, 2021 9:08:06 AM Subject: Re: [XRF] Xrf coffee ground
Geo Unlike Am241,I am not familiar with the X-ray xrf??spectrum yet Yes I will stack if I have to go beyond 3 secs to cool off. Regarding Br ,it is coming ?likely?from the coffee The clear??colorless thin kitchen wrap??is not contributing??to??bromine Anything with Br will probably??have a??darker shade in my opinion? Yes I will??keep a file My ALARA is inverse square law Get out of the room??and use remote control??to trigger X-ray at a safe distance? There will be ringing sound until completion Seems to work Scatter within room will always be there? Thanks On Friday, February 12, 2021, 10:17 PM, GEOelectronics@... wrote: Thanks for that analysis Taray. We should keep quite about the free vitamins that are unknowingly being included in coffee, they will raise the price!(joke).
A few real ideas -
We can see clearly on your scan the internal filtering and physics of the beam. Notice the "hump" on? the right right side above 20 keV.?
Scan the kitchen wrap alone to establish baseline. Maybe a compressed ball of it. Keep that file, it can be subtracted from scans of actual samples
Think about "stacking". This is when the beam needs to be cooled off between scans or the scan needs to be interrupted. Pause the Si-PIN from counting until the beam is ready again, then start it up and apply beam. If the setup is unchanged, the peaks of interest will stack up on top of the previous ones.
ALARA- Geo
From: "taray singh via groups.io" <sukhjez@...> To: [email protected]Sent: Friday, February 12, 2021 4:04:13 AM Subject: Re: [XRF] Xrf coffee ground
Hi guys
No analysis is complete without a control
Here is an xrf of the? same fresh coffee beans (partly crushed to make it more homogenous)
Wrapped in a thin kitchen plastic sheet.
In line with the higher count rate,peaking time? increased to 32.
Xray exposure 3 secs
?This time peaks are seen more clearly
This is partly due to the hot water scavenging effect? of the coffee beans? by the coffee maker? releasing ingredients into the cup.
This time peaks noted are Fe,Ni ,Br and Rb plus Pb
Pb is probably due to residual contamination?
Rb is obvious this time
Brazilian coffee is well known for this.
Mine is Vietnamese
Bromine is something unexpected
.It?could be? due to bromine pesticides used in the plantation.
Looks like I? cannot find any faults in Nescafe Milano? coffee maker used in my office
But I will not drink the coffee
Coffee fresh? mca attached.
Taray
|
Geo Unlike Am241,I am not familiar with the X-ray xrf??spectrum yet Yes I will stack if I have to go beyond 3 secs to cool off. Regarding Br ,it is coming ?likely?from the coffee The clear??colorless thin kitchen wrap??is not contributing??to??bromine Anything with Br will probably??have a??darker shade in my opinion? Yes I will??keep a file My ALARA is inverse square law Get out of the room??and use remote control??to trigger X-ray at a safe distance? There will be ringing sound until completion Seems to work Scatter within room will always be there? Thanks
On Friday, February 12, 2021, 10:17 PM, GEOelectronics@... wrote: Thanks for that analysis Taray. We should keep quite about the free vitamins that are unknowingly being included in coffee, they will raise the price!(joke).
A few real ideas -
We can see clearly on your scan the internal filtering and physics of the beam. Notice the "hump" on? the right right side above 20 keV.?
Scan the kitchen wrap alone to establish baseline. Maybe a compressed ball of it. Keep that file, it can be subtracted from scans of actual samples
Think about "stacking". This is when the beam needs to be cooled off between scans or the scan needs to be interrupted. Pause the Si-PIN from counting until the beam is ready again, then start it up and apply beam. If the setup is unchanged, the peaks of interest will stack up on top of the previous ones.
ALARA- Geo
From: "taray singh via groups.io" <sukhjez@...> To: [email protected]Sent: Friday, February 12, 2021 4:04:13 AM Subject: Re: [XRF] Xrf coffee ground
Hi guys
No analysis is complete without a control
Here is an xrf of the? same fresh coffee beans (partly crushed to make it more homogenous)
Wrapped in a thin kitchen plastic sheet.
In line with the higher count rate,peaking time? increased to 32.
Xray exposure 3 secs
?This time peaks are seen more clearly
This is partly due to the hot water scavenging effect? of the coffee beans? by the coffee maker? releasing ingredients into the cup.
This time peaks noted are Fe,Ni ,Br and Rb plus Pb
Pb is probably due to residual contamination?
Rb is obvious this time
Brazilian coffee is well known for this.
Mine is Vietnamese
Bromine is something unexpected
.It?could be? due to bromine pesticides used in the plantation.
Looks like I? cannot find any faults in Nescafe Milano? coffee maker used in my office
But I will not drink the coffee
Coffee fresh? mca attached.
Taray
|
|
|
Thanks for that analysis Taray. We should keep quite about the free vitamins that are unknowingly being included in coffee, they will raise the price!(joke).
A few real ideas -
We can see clearly on your scan the internal filtering and physics of the beam. Notice the "hump" on? the right right side above 20 keV.?
Scan the kitchen wrap alone to establish baseline. Maybe a compressed ball of it. Keep that file, it can be subtracted from scans of actual samples
Think about "stacking". This is when the beam needs to be cooled off between scans or the scan needs to be interrupted. Pause the Si-PIN from counting until the beam is ready again, then start it up and apply beam. If the setup is unchanged, the peaks of interest will stack up on top of the previous ones.
ALARA- Geo
From: "taray singh via groups.io" <sukhjez@...> To: [email protected]Sent: Friday, February 12, 2021 4:04:13 AM Subject: Re: [XRF] Xrf coffee ground
Hi guys
No analysis is complete without a control
Here is an xrf of the? same fresh coffee beans (partly crushed to make it more homogenous)
Wrapped in a thin kitchen plastic sheet.
In line with the higher count rate,peaking time? increased to 32.
Xray exposure 3 secs
?This time peaks are seen more clearly
This is partly due to the hot water scavenging effect? of the coffee beans? by the coffee maker? releasing ingredients into the cup.
This time peaks noted are Fe,Ni ,Br and Rb plus Pb
Pb is probably due to residual contamination?
Rb is obvious this time
Brazilian coffee is well known for this.
Mine is Vietnamese
Bromine is something unexpected
.It?could be? due to bromine pesticides used in the plantation.
Looks like I? cannot find any faults in Nescafe Milano? coffee maker used in my office
But I will not drink the coffee
Coffee fresh? mca attached.
Taray
|
Hi guys
No analysis is complete without a control
Here is an xrf of the? same fresh coffee beans (partly crushed to make it more homogenous)
Wrapped in a thin kitchen plastic sheet.
In line with the higher count rate,peaking time? increased to 32.
Xray exposure 3 secs
?This time peaks are seen more clearly
This is partly due to the hot water scavenging effect? of the coffee beans? by the coffee maker? releasing ingredients into the cup.
This time peaks noted are Fe,Ni ,Br and Rb plus Pb
Pb is probably due to residual contamination?
Rb is obvious this time
Brazilian coffee is well known for this.
Mine is Vietnamese
Bromine is something unexpected
.It?could be? due to bromine pesticides used in the plantation.
Looks like I? cannot find any faults in Nescafe Milano? coffee maker used in my office
But I will not drink the coffee
Coffee fresh? mca attached.
Taray
|
Good for you. I have a? 4X5"polaroid film holder, will FUji version fit?
also 4x5 cut film (negative) and regular X-Ray film holders too.
From: "taray singh via groups.io" <sukhjez@...> To: [email protected]Sent: Thursday, February 11, 2021 6:55:34 AM Subject: Re: [XRF] Xrf coffee ground
Geo Yes I did and success. That was one of my preliminary test? I used a green xray scintillation screen Also venturing into x ray photography with fujifilm polaroid? So far have??not ?got?the right exposure time Luckily less kvp needed for xrf Taray On Thursday, February 11, 2021, 8:45 PM, GEOelectronics@... wrote: Good start......
Looks like your internal filtering is a bit lower than mine,
This could be interesting.
Can you see the beam with a screen? A gadolinium based screen shows best.
Geo
From: "taray singh via groups.io" <sukhjez@...> To: [email protected]Sent: Thursday, February 11, 2021 6:35:29 AM Subject: [XRF] Xrf coffee ground
Hi guys
Here is an repeat xrf of my office coffee .
This time with x ray? source
KV 60
MA 0.1
Exposure time about 5 secs??
ALARA protections taken
The peaks are Fe,Ni,Zn and possibly rubidium
The Fe/Ni could be from any stainless steel heating element during roasting or brewing plus naturally existing.
Ni is a concern since some of us including myself have nickel allergy.
There appears to? be lots of noise on the left?
Kindly pm any questions regarding setup
Taray
|
Geo Yes I did and success. That was one of my preliminary test? I used a green xray scintillation screen Also venturing into x ray photography with fujifilm polaroid? So far have??not ?got?the right exposure time Luckily less kvp needed for xrf Taray
On Thursday, February 11, 2021, 8:45 PM, GEOelectronics@... wrote: Good start......
Looks like your internal filtering is a bit lower than mine,
This could be interesting.
Can you see the beam with a screen? A gadolinium based screen shows best.
Geo
From: "taray singh via groups.io" <sukhjez@...> To: [email protected]Sent: Thursday, February 11, 2021 6:35:29 AM Subject: [XRF] Xrf coffee ground
Hi guys
Here is an repeat xrf of my office coffee .
This time with x ray? source
KV 60
MA 0.1
Exposure time about 5 secs??
ALARA protections taken
The peaks are Fe,Ni,Zn and possibly rubidium
The Fe/Ni could be from any stainless steel heating element during roasting or brewing plus naturally existing.
Ni is a concern since some of us including myself have nickel allergy.
There appears to? be lots of noise on the left?
Kindly pm any questions regarding setup
Taray
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Good start......
Looks like your internal filtering is a bit lower than mine,
This could be interesting.
Can you see the beam with a screen? A gadolinium based screen shows best.
Geo
From: "taray singh via groups.io" <sukhjez@...> To: [email protected]Sent: Thursday, February 11, 2021 6:35:29 AM Subject: [XRF] Xrf coffee ground
Hi guys
Here is an repeat xrf of my office coffee .
This time with x ray? source
KV 60
MA 0.1
Exposure time about 5 secs??
ALARA protections taken
The peaks are Fe,Ni,Zn and possibly rubidium
The Fe/Ni could be from any stainless steel heating element during roasting or brewing plus naturally existing.
Ni is a concern since some of us including myself have nickel allergy.
There appears to? be lots of noise on the left?
Kindly pm any questions regarding setup
Taray
|
Hi guys
Here is an repeat xrf of my office coffee .
This time with x ray? source
KV 60
MA 0.1
Exposure time about 5 secs??
ALARA protections taken
The peaks are Fe,Ni,Zn and possibly rubidium
The Fe/Ni could be from any stainless steel heating element during roasting or brewing plus naturally existing.
Ni is a concern since some of us including myself have nickel allergy.
There appears to? be lots of noise on the left?
Kindly pm any questions regarding setup
Taray
|
Re: Small Sample Size XRF with low power (OTHER) excitation
If everything transferred and was entered correctly, these is the last steps and you can add oxygen to your paper. Push OK on the EXPRESSION menu now. On your SPECTRA LIST box, HIDE live_data_1 and live_data-2. On the MENU?bar select DISPLAY and make sure LINEAR is selected. If everything was transferred and entered correctly there will be a new line on the SPECTRA LIST at the bottom, select that. The display shown should look very similar to this: Bi-N-Ge-O Bingo! 
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Re: Small Sample Size XRF with low power (OTHER) excitation
This is the germanium step.
Add Ge to your paper= Bi-N-Ge
Then go to the DPPMCA program's menu bar, press ANALYSIS
From the drop down menu, select EXPRESSION, then on the action box add this formula to the EXPRESSION box at the very bottom:
live_data_1-live_data_2
Cut and past if you must- it has to be exactly entered.
Geo
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Re: Small Sample Size XRF with low power (OTHER) excitation
Bi-N
Now add nitrogen (N) to you paper.
Then load the .mca file live_data_2 into your program. It was made by removing the sample from the jig and running with no sample target for 2 minutes. This is leakthrough from the exciter and will be addressed in days to come. 
Next steps in the following 2 posts, we're almost there.
Geo
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Re: Small Sample Size XRF with low power (OTHER) excitation
Enough work, ;let's play a game. The periodic table of elements game.
Bi-
First we do Bismuth. So mark Bi on a piece of paper, then load this file into your DPPMCA program, it should show up on your spectrum chart as live_data_1
This .mca was made with the setup in the picture, run for 2 minutes.
The next post will explain the next step. Prepare to be amazed.
Geo
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