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Re: Si-PIN Detector Background?

 

3600s BG scan running on the one in the chamber- using it's current fine tuned peak value of 4.8us.

Over this winter I'll redo all the element scans from my article on APXS/XRF with the Si-PIN detector and CdTe detector. That will be the final chapter until some iridium shows up- what was thought to be Ir in the original NaI(Tl) scans were later confirmed with the SDD to actually be W.

Grrrrrrrrr..........That was my SECOND mistake!

Geo
Re: Si-PIN Detector Background?

 

¿ªÔÆÌåÓý

It would be interesting to see what that same run would look like but using a 4 usec peaking time.

Dud

?

From: [email protected] [mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Thursday, October 15, 2020 5:08 PM
To: [email protected]
Subject: [XRF] Si-PIN Detector Background?

?

Someone asked about background counts on the Si-PIN detector.
That's always the first thing to test with a new one.? This is a 1 hour scan on SN-18812, no source or X-Rays around, minimal if any shielding.

Notice the highest count at ~28 keV = 1 CPH - sweet.
Probably Cosmic Ray muons.
Geo

1_HR_BACKGROUND_SN_18812.png
Re: Supplements exposed

 

Yes DPPMCA is for a real technician........You can also download the program, but to use it you must buy the code key.

Geo

----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 20:45:34 -0400 (EDT)
Subject: Re: [XRF] Supplements exposed

Geo

I have previously downloaded this Fp software manual.

It helps me understand the limitations of Dpmcca

Taray
Re: Supplements exposed

taray singh
 

Geo

I have previously downloaded this Fp software manual.

It helps me understand the limitations of Dpmcca

Taray

XRS-FP Software Guide - Amptek v.6.4.4.pdf
XRS-FP Software Guide - Amptek v.6.4.4.pdf

Si-PIN Detector Background?

 

Someone asked about background counts on the Si-PIN detector.
That's always the first thing to test with a new one.? This is a 1 hour scan on SN-18812, no source or X-Rays around, minimal if any shielding.

Notice the highest count at ~28 keV = 1 CPH - sweet.
Probably Cosmic Ray muons.
Geo

1_HR_BACKGROUND_SN_18812.png

1_HR_BACKGROUND_SN_18812.png
1_HR_BACKGOUND_SN_18812.mca
1_HR_BACKGOUND_SN_18812.mca

Re: Trinitite

 
Edited

Another oldie from 2014. Tower-metal X-Ray Spectrum Analysis (NO EXCITER).
AMPTEK 1-2-3 SDD
SDD has slightly lower energy capability than Si-PIN, and better resolution. The Si-PIN is more rugged.

I've been chasing these uranium L lines a long time.

2014-Towermetal-X-Ray-Spectrum-Analysis-NO- EXCITER.png

2014-Towermetal-X-Ray-Spectrum-Analysis-NO- EXCITER.png
TrinityGlobSide2.mca
TrinityGlobSide2.mca

Re: Trinitite Sub Topic 1 Where's the Uranium?

 
Edited

Low-Level Determination of Plutonium by Gamma and?L X-ray Spectroscopy
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Heino Nitsche, Raymond C. Gatti, Shan C. Lee
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Lawrence Berkeley Laboratory
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? University of California
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Earth Sciences Division
April1991
?
Accepted for publication in the Journal of?Radioanalytical and Nuclear Chemistry.
This work was supported by the Yucca Mountain Site Characterization Project Office as part of the U.S.?Civilian Radioactive Waste Management Project through the Los Alamos National Laboratory. The Yucca?Mountain Site Characterization Project is managed by the U.S. Department of Energy, Yucca Mountain?Project. This work was performed at the Lawrence Berkeley Laboratory, which is operated by the University?of California for the U.S. Department of Energy under Contract DE-AC03-76SF00098.
ABSTRACT
We have developed an analytical method for detection of 239pu in aqueous samples at?concentrations as low as 10e-10M. This nuclear counting technique utilizes the uranium L X-rays,?which follow the alpha decay of plutonium. Because L X-rays are specific for the element and not for?the individual isotope, the isotopic composition of the plutonium sample must be known. The?counting efficiency in the 11-23 keV range is determined from a plutonium standard, and the?concentration of the sample is then calculated from the L X-ray count and the isotopic composition.
The total L X-ray count is corrected for possible contributions from? other radionuclides present as?impurities by measuring the low-energy gamma spectrum for each contaminant to establish specific?photon/X-ray ratios. The ratios are important when 241Pu and 242pu are measured, because the?respective decay chain members produce non-U L X-rays. This new method can replace the use of
labor-intensive radiochemical separation techniques and elaborate activation methods for analysis of?239pu in aqueous samples. It is also applicable for assaying plutonium in liquid wastes that pose?possible hazards to the environment.

Bingo.
Geo
Re: Supplements exposed

 

"do see some small peaks on extreme left with my 1024 settings.

1.85 is probably silicon escape peak."


Si escape peak is below every major photopeak -1.74keV below. Fortunately it is small compared to photopeak of element.


FP software takes that out and adds it back to photopeak. FP is what's in XRF guns etc. Cost is thousands USD. That's how they can do Mg and Al, Si etc. Otherwise uses same hardware as us.


Geo


----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 11:28:27 -0400 (EDT)
Subject: Re: [XRF] Supplements exposed

I do see some small peaks on extreme left with my 1024 settings.

1.85 is probably silicon escape peak.

Argon not??emphasized yet

I will check out with ur??methods above.

Titanium too maybe in white paint.

There are other things I am still learning?

Slow learner I guess?

Hey why don¡¯t you scan ur??

?iron supplements to see what comes out through the container?

Taray





On Thursday, October 15, 2020, 11:18 PM, GEOelectronics@... wrote:

Yes low energy limits on Si-PIN, are you seeing Argon gas in your scans? Comes from air, ionized by alpha particles. Paper filter on exciter helps, also lightweight gas purge, even just a small fan.

? Possible to see Ti not in sample but in your environment too. I traced it down to the material on top of the desk, pigment included Ti oxide....

Test everything
Geo

----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 09:36:04 -0400 (EDT)
Subject: Re: [XRF] Supplements exposed

Geo

There are supplements in oxide form.

One example is Magnesium oxide?

Not well absorbed but due to huge Mg load will overcome this obstacle?

Mg??oxide supplements may be friendly to xrf .

But Si pin don¡¯t reciprocate?

Taray





On Thursday, October 15, 2020, 8:51 PM, GEOelectronics@... wrote:


Thanks for the explanation of the molecules Taray!? This is important and answers some questions about confusing scans of mine on similar items.

Test everything.
Geo


----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 07:59:07 -0400 (EDT)
Subject: [XRF] Supplements exposed

Hi guys
Drug companies label their supplements by molecular weight of the compound.
?
So the actual amount of? study element will vary from one compound to another .
?
For example 100 mg of Zn oxide will contain more Zn? than 100 mg of Zn citrate.
?
Most drugs are weak acids or bases to aid in gut absorption.In this case this is Zn citrate...a weak acid
?
But this will increase their molecular weight with less? study element for the same weight of drug
?
This may be good for the drug but bad for xrf.
?
Drug? companies? produce supplements which are safe ,stable and bioavailable.
?
Xrf is never in the picture.
?
Furthermore? most of these oral supplements consist of? a chemical matrix of low Z? ingredients in the capsule and? the powder within.
?
Altogether? this high molecular weight drugs within a loose matrix will dilute the elements for xrf
?
Despite? this , I can? still can do a qualitative xrf check for the mineral element by just scanning though the plastic bottle? with si pin.
?
No need for an elaborate lab analysis .
?
But the downside is I am not able to detect? ?
?
supplements containing lower Z such as boron,calcium or magnesium.
?
Here is a scan for Lifeextension Zinc capsules?
?
Taray
Re: Supplements exposed

 

"

Hey why don¡¯t you scan ur??

?iron supplements to see what comes out through the container?

Taray"


It's on the to-do list. Right now researching documents RE: U L-X-Rays.


You are fast learner, how long have you had hands on? 10 days? 2 weeks max?


wow.


Geo



----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 11:28:27 -0400 (EDT)
Subject: Re: [XRF] Supplements exposed

I do see some small peaks on extreme left with my 1024 settings.

1.85 is probably silicon escape peak.

Argon not??emphasized yet

I will check out with ur??methods above.

Titanium too maybe in white paint.

There are other things I am still learning?

Slow learner I guess?

Hey why don¡¯t you scan ur??

?iron supplements to see what comes out through the container?

Taray





On Thursday, October 15, 2020, 11:18 PM, GEOelectronics@... wrote:

Yes low energy limits on Si-PIN, are you seeing Argon gas in your scans? Comes from air, ionized by alpha particles. Paper filter on exciter helps, also lightweight gas purge, even just a small fan.

? Possible to see Ti not in sample but in your environment too. I traced it down to the material on top of the desk, pigment included Ti oxide....

Test everything
Geo

----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 09:36:04 -0400 (EDT)
Subject: Re: [XRF] Supplements exposed

Geo

There are supplements in oxide form.

One example is Magnesium oxide?

Not well absorbed but due to huge Mg load will overcome this obstacle?

Mg??oxide supplements may be friendly to xrf .

But Si pin don¡¯t reciprocate?

Taray





On Thursday, October 15, 2020, 8:51 PM, GEOelectronics@... wrote:


Thanks for the explanation of the molecules Taray!? This is important and answers some questions about confusing scans of mine on similar items.

Test everything.
Geo


----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 07:59:07 -0400 (EDT)
Subject: [XRF] Supplements exposed

Hi guys
Drug companies label their supplements by molecular weight of the compound.
?
So the actual amount of? study element will vary from one compound to another .
?
For example 100 mg of Zn oxide will contain more Zn? than 100 mg of Zn citrate.
?
Most drugs are weak acids or bases to aid in gut absorption.In this case this is Zn citrate...a weak acid
?
But this will increase their molecular weight with less? study element for the same weight of drug
?
This may be good for the drug but bad for xrf.
?
Drug? companies? produce supplements which are safe ,stable and bioavailable.
?
Xrf is never in the picture.
?
Furthermore? most of these oral supplements consist of? a chemical matrix of low Z? ingredients in the capsule and? the powder within.
?
Altogether? this high molecular weight drugs within a loose matrix will dilute the elements for xrf
?
Despite? this , I can? still can do a qualitative xrf check for the mineral element by just scanning though the plastic bottle? with si pin.
?
No need for an elaborate lab analysis .
?
But the downside is I am not able to detect? ?
?
supplements containing lower Z such as boron,calcium or magnesium.
?
Here is a scan for Lifeextension Zinc capsules?
?
Taray
Re: Supplements exposed

taray singh
 

I do see some small peaks on extreme left with my 1024 settings.

1.85 is probably silicon escape peak.

Argon not??emphasized yet

I will check out with ur??methods above.

Titanium too maybe in white paint.

There are other things I am still learning?

Slow learner I guess?

Hey why don¡¯t you scan ur??

?iron supplements to see what comes out through the container?

Taray





On Thursday, October 15, 2020, 11:18 PM, GEOelectronics@... wrote:

Yes low energy limits on Si-PIN, are you seeing Argon gas in your scans? Comes from air, ionized by alpha particles. Paper filter on exciter helps, also lightweight gas purge, even just a small fan.

? Possible to see Ti not in sample but in your environment too. I traced it down to the material on top of the desk, pigment included Ti oxide....

Test everything
Geo

----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 09:36:04 -0400 (EDT)
Subject: Re: [XRF] Supplements exposed

Geo

There are supplements in oxide form.

One example is Magnesium oxide?

Not well absorbed but due to huge Mg load will overcome this obstacle?

Mg??oxide supplements may be friendly to xrf .

But Si pin don¡¯t reciprocate?

Taray





On Thursday, October 15, 2020, 8:51 PM, GEOelectronics@... wrote:


Thanks for the explanation of the molecules Taray!? This is important and answers some questions about confusing scans of mine on similar items.

Test everything.
Geo


----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 07:59:07 -0400 (EDT)
Subject: [XRF] Supplements exposed

Hi guys
Drug companies label their supplements by molecular weight of the compound.
?
So the actual amount of? study element will vary from one compound to another .
?
For example 100 mg of Zn oxide will contain more Zn? than 100 mg of Zn citrate.
?
Most drugs are weak acids or bases to aid in gut absorption.In this case this is Zn citrate...a weak acid
?
But this will increase their molecular weight with less? study element for the same weight of drug
?
This may be good for the drug but bad for xrf.
?
Drug? companies? produce supplements which are safe ,stable and bioavailable.
?
Xrf is never in the picture.
?
Furthermore? most of these oral supplements consist of? a chemical matrix of low Z? ingredients in the capsule and? the powder within.
?
Altogether? this high molecular weight drugs within a loose matrix will dilute the elements for xrf
?
Despite? this , I can? still can do a qualitative xrf check for the mineral element by just scanning though the plastic bottle? with si pin.
?
No need for an elaborate lab analysis .
?
But the downside is I am not able to detect? ?
?
supplements containing lower Z such as boron,calcium or magnesium.
?
Here is a scan for Lifeextension Zinc capsules?
?
Taray
Re: Supplements exposed

 

Yes low energy limits on Si-PIN, are you seeing Argon gas in your scans? Comes from air, ionized by alpha particles. Paper filter on exciter helps, also lightweight gas purge, even just a small fan.

? Possible to see Ti not in sample but in your environment too. I traced it down to the material on top of the desk, pigment included Ti oxide....

Test everything
Geo

----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 09:36:04 -0400 (EDT)
Subject: Re: [XRF] Supplements exposed

Geo

There are supplements in oxide form.

One example is Magnesium oxide?

Not well absorbed but due to huge Mg load will overcome this obstacle?

Mg??oxide supplements may be friendly to xrf .

But Si pin don¡¯t reciprocate?

Taray





On Thursday, October 15, 2020, 8:51 PM, GEOelectronics@... wrote:


Thanks for the explanation of the molecules Taray!? This is important and answers some questions about confusing scans of mine on similar items.

Test everything.
Geo


----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 07:59:07 -0400 (EDT)
Subject: [XRF] Supplements exposed

Hi guys
Drug companies label their supplements by molecular weight of the compound.
?
So the actual amount of? study element will vary from one compound to another .
?
For example 100 mg of Zn oxide will contain more Zn? than 100 mg of Zn citrate.
?
Most drugs are weak acids or bases to aid in gut absorption.In this case this is Zn citrate...a weak acid
?
But this will increase their molecular weight with less? study element for the same weight of drug
?
This may be good for the drug but bad for xrf.
?
Drug? companies? produce supplements which are safe ,stable and bioavailable.
?
Xrf is never in the picture.
?
Furthermore? most of these oral supplements consist of? a chemical matrix of low Z? ingredients in the capsule and? the powder within.
?
Altogether? this high molecular weight drugs within a loose matrix will dilute the elements for xrf
?
Despite? this , I can? still can do a qualitative xrf check for the mineral element by just scanning though the plastic bottle? with si pin.
?
No need for an elaborate lab analysis .
?
But the downside is I am not able to detect? ?
?
supplements containing lower Z such as boron,calcium or magnesium.
?
Here is a scan for Lifeextension Zinc capsules?
?
Taray
Re: Supplements exposed

 

Yes low energy limits on Si-PIN, are you seeing Argon gas in your scans? Comes from air, ionized by alpha particles. Paper filter on exciter helps, also lightweight gas purge, even just a small fan.

? Possible to see Ti not in sample but in your environment too. I traced it down to the material on top of the desk, pigment included Ti oxide....

Test everything
Geo

----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 09:36:04 -0400 (EDT)
Subject: Re: [XRF] Supplements exposed

Geo

There are supplements in oxide form.

One example is Magnesium oxide?

Not well absorbed but due to huge Mg load will overcome this obstacle?

Mg??oxide supplements may be friendly to xrf .

But Si pin don¡¯t reciprocate?

Taray





On Thursday, October 15, 2020, 8:51 PM, GEOelectronics@... wrote:


Thanks for the explanation of the molecules Taray!? This is important and answers some questions about confusing scans of mine on similar items.

Test everything.
Geo


----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 07:59:07 -0400 (EDT)
Subject: [XRF] Supplements exposed

Hi guys
Drug companies label their supplements by molecular weight of the compound.
?
So the actual amount of? study element will vary from one compound to another .
?
For example 100 mg of Zn oxide will contain more Zn? than 100 mg of Zn citrate.
?
Most drugs are weak acids or bases to aid in gut absorption.In this case this is Zn citrate...a weak acid
?
But this will increase their molecular weight with less? study element for the same weight of drug
?
This may be good for the drug but bad for xrf.
?
Drug? companies? produce supplements which are safe ,stable and bioavailable.
?
Xrf is never in the picture.
?
Furthermore? most of these oral supplements consist of? a chemical matrix of low Z? ingredients in the capsule and? the powder within.
?
Altogether? this high molecular weight drugs within a loose matrix will dilute the elements for xrf
?
Despite? this , I can? still can do a qualitative xrf check for the mineral element by just scanning though the plastic bottle? with si pin.
?
No need for an elaborate lab analysis .
?
But the downside is I am not able to detect? ?
?
supplements containing lower Z such as boron,calcium or magnesium.
?
Here is a scan for Lifeextension Zinc capsules?
?
Taray
Re: Supplements exposed

taray singh
 

Geo

There are supplements in oxide form.

One example is Magnesium oxide?

Not well absorbed but due to huge Mg load will overcome this obstacle?

Mg??oxide supplements may be friendly to xrf .

But Si pin don¡¯t reciprocate?

Taray





On Thursday, October 15, 2020, 8:51 PM, GEOelectronics@... wrote:


Thanks for the explanation of the molecules Taray!? This is important and answers some questions about confusing scans of mine on similar items.

Test everything.
Geo


----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 07:59:07 -0400 (EDT)
Subject: [XRF] Supplements exposed

Hi guys
Drug companies label their supplements by molecular weight of the compound.
?
So the actual amount of? study element will vary from one compound to another .
?
For example 100 mg of Zn oxide will contain more Zn? than 100 mg of Zn citrate.
?
Most drugs are weak acids or bases to aid in gut absorption.In this case this is Zn citrate...a weak acid
?
But this will increase their molecular weight with less? study element for the same weight of drug
?
This may be good for the drug but bad for xrf.
?
Drug? companies? produce supplements which are safe ,stable and bioavailable.
?
Xrf is never in the picture.
?
Furthermore? most of these oral supplements consist of? a chemical matrix of low Z? ingredients in the capsule and? the powder within.
?
Altogether? this high molecular weight drugs within a loose matrix will dilute the elements for xrf
?
Despite? this , I can? still can do a qualitative xrf check for the mineral element by just scanning though the plastic bottle? with si pin.
?
No need for an elaborate lab analysis .
?
But the downside is I am not able to detect? ?
?
supplements containing lower Z such as boron,calcium or magnesium.
?
Here is a scan for Lifeextension Zinc capsules?
?
Taray
Re: Supplements exposed

 


Thanks for the explanation of the molecules Taray!? This is important and answers some questions about confusing scans of mine on similar items.

Test everything.
Geo


----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To: [email protected]
Sent: Thu, 15 Oct 2020 07:59:07 -0400 (EDT)
Subject: [XRF] Supplements exposed

Hi guys
Drug companies label their supplements by molecular weight of the compound.
?
So the actual amount of? study element will vary from one compound to another .
?
For example 100 mg of Zn oxide will contain more Zn? than 100 mg of Zn citrate.
?
Most drugs are weak acids or bases to aid in gut absorption.In this case this is Zn citrate...a weak acid
?
But this will increase their molecular weight with less? study element for the same weight of drug
?
This may be good for the drug but bad for xrf.
?
Drug? companies? produce supplements which are safe ,stable and bioavailable.
?
Xrf is never in the picture.
?
Furthermore? most of these oral supplements consist of? a chemical matrix of low Z? ingredients in the capsule and? the powder within.
?
Altogether? this high molecular weight drugs within a loose matrix will dilute the elements for xrf
?
Despite? this , I can? still can do a qualitative xrf check for the mineral element by just scanning though the plastic bottle? with si pin.
?
No need for an elaborate lab analysis .
?
But the downside is I am not able to detect? ?
?
supplements containing lower Z such as boron,calcium or magnesium.
?
Here is a scan for Lifeextension Zinc capsules?
?
Taray
Supplements exposed

taray singh
 

Hi guys
Drug companies label their supplements by molecular weight of the compound.
?
So the actual amount of? study element will vary from one compound to another .
?
For example 100 mg of Zn oxide will contain more Zn? than 100 mg of Zn citrate.
?
Most drugs are weak acids or bases to aid in gut absorption.In this case this is Zn citrate...a weak acid
?
But this will increase their molecular weight with less? study element for the same weight of drug
?
This may be good for the drug but bad for xrf.
?
Drug? companies? produce supplements which are safe ,stable and bioavailable.
?
Xrf is never in the picture.
?
Furthermore? most of these oral supplements consist of? a chemical matrix of low Z? ingredients in the capsule and? the powder within.
?
Altogether? this high molecular weight drugs within a loose matrix will dilute the elements for xrf
?
Despite? this , I can? still can do a qualitative xrf check for the mineral element by just scanning though the plastic bottle? with si pin.
?
No need for an elaborate lab analysis .
?
But the downside is I am not able to detect? ?
?
supplements containing lower Z such as boron,calcium or magnesium.
?
Here is a scan for Lifeextension Zinc capsules?
?
Taray

zn cap.PNG
zn capsules.mca
zn capsules.mca
Zn pic.jpg

Re: XRF of Industrial alloy sheet metal 70 Cu 30 Ni

 

All good advice Dud.
And I agree, but in Feb 2014 I didn't know that yet.
Thanks for helping us all get from there to here, and there's so far yet to go.

Geo


From: "DFEMER" <dfemer@...>
To: [email protected]
Sent: Wednesday, October 14, 2020 3:39:50 PM
Subject: Re: [XRF] XRF of Industrial alloy sheet metal 70 Cu 30 Ni

Geo,

What beam current where you using? Based on the dead time (DT) of 25% the current could probably be backed off a bit. Note that most of this DT is dealing with the higher energy counts that you¡¯re not interested in due to the 50 kV tube voltage. The optimal approach would be to set the tube HV to just above the energy range of interest. In this case Cu, which has a binding energy of 8.8 keV. So a 10 or 15 kV HV would eliminate all the high energy counting and just optimize the energy range of interest. You would then set a current to keep the dead time in the 10 ¨C 15% range and you could play with the peaking time to optimize the resolution. For low count rates use a long peaking time which will get better resolution and use a shorter time for higher count rates but with lower resolution.

When I run an unknown it¡¯ll be 50kV, then a run at 40, then a run at 20 which gets the HV near a general binding energy range which gives a much better resolution and count time and lowers the limit of detection.

Dud

?

From: [email protected] [mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Wednesday, October 14, 2020 12:21 PM
To: [email protected]
Subject: [XRF] XRF of Industrial alloy sheet metal 70 Cu 30 Ni

?

This is a sample cut from a piece of sheet metal, the assay printed on it was Cu-70% Ni-30%.


,mca and pics of the scan attached. Later will post pics of setup. Like the pictures indicate - SDD sensor, XRF via W tube, 50kVp @ 10 uA.

AMPTEK_SDD-X-Ray-XRF-50kVp-10uA-Metals_XRF-Cu-Ni-70-30-005-Close-Both.png
Re: XRF of Industrial alloy sheet metal 70 Cu 30 Ni

 

¿ªÔÆÌåÓý

Geo,

What beam current where you using? Based on the dead time (DT) of 25% the current could probably be backed off a bit. Note that most of this DT is dealing with the higher energy counts that you¡¯re not interested in due to the 50 kV tube voltage. The optimal approach would be to set the tube HV to just above the energy range of interest. In this case Cu, which has a binding energy of 8.8 keV. So a 10 or 15 kV HV would eliminate all the high energy counting and just optimize the energy range of interest. You would then set a current to keep the dead time in the 10 ¨C 15% range and you could play with the peaking time to optimize the resolution. For low count rates use a long peaking time which will get better resolution and use a shorter time for higher count rates but with lower resolution.

When I run an unknown it¡¯ll be 50kV, then a run at 40, then a run at 20 which gets the HV near a general binding energy range which gives a much better resolution and count time and lowers the limit of detection.

Dud

?

From: [email protected] [mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Wednesday, October 14, 2020 12:21 PM
To: [email protected]
Subject: [XRF] XRF of Industrial alloy sheet metal 70 Cu 30 Ni

?

This is a sample cut from a piece of sheet metal, the assay printed on it was Cu-70% Ni-30%.


,mca and pics of the scan attached. Later will post pics of setup. Like the pictures indicate - SDD sensor, XRF via W tube, 50kVp @ 10 uA.

AMPTEK_SDD-X-Ray-XRF-50kVp-10uA-Metals_XRF-Cu-Ni-70-30-005-Close-Both.png
Re: XRF of Industrial alloy sheet metal 70 Cu 30 Ni

 

Same .mca file as above but with the full scan showing on the display.

AMPTEK_SDD-X-Ray-XRF-50kVp-10uA-Metals_XRF-Cu-Ni-70-30-005-Nickel-Full.png

AMPTEK_SDD-X-Ray-XRF-50kVp-10uA-Metals_XRF-Cu-Ni-70-30-005-Nickel-Full.png

XRF of Industrial alloy sheet metal 70 Cu 30 Ni

 

This is a sample cut from a piece of sheet metal, the assay printed on it was Cu-70% Ni-30%.


,mca and pics of the scan attached. Later will post pics of setup. Like the pictures indicate - SDD sensor, XRF via W tube, 50kVp @ 10 uA.

AMPTEK_SDD-X-Ray-XRF-50kVp-10uA-Metals_XRF-Cu-Ni-70-30-005-Close-Both.png

Cu-Ni-70-30-.005.mca
Cu-Ni-70-30-.005.mca
AMPTEK_SDD-X-Ray-XRF-50kVp-10uA-Metals_XRF-Cu-Ni-70-30-005-Close-Both.png

A Penny for your. thoughts or US Cent XRF Fail

 

XRF of a modern US cent, thin copper over zinc core. One side has the copper removed. XRF of both sides .mca's attached. Exciter = W target tube, @ 50kV / 10 uA

US-Cent-XRF.png




This is a fail because the HV is set to high, and so is the current, causing excitation deeper than need be, allowing Zn to overwhelm the copper signal.

Am excitation would prove to be a better choice, in that the Alpha Particles help with surface excitation only.

A little common sense prevails.

Geo

US-Cent-XRF.png
Zn-US-2012-Penny-Copper-Side.mca
Zn-US-2012-Penny-Copper-Side.mca
Zn-US-2012-Penny-Copper-Removed-Side.mca
Zn-US-2012-Penny-Copper-Removed-Side.mca

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