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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

 

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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
 

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
 
Edited

3600s Background Scan. Peaking time previously fine tuned to 4.8 us.
No rad sources or Exciter sources.
Shop made Amptek Si-PIN XR-100-CR flex-cable connected to Amptek DP-5/PC5 stack in a shop made housing. Sensor head is in a shop made aluminum lined 3/8" lead chamber/shield with a port to introduce weak tube generated microfocus X-Rays.
All the hits are 1 count, and 1 channel wide.

The first 0-2keV is cut off because of system noise. This is easy using the RANGE settings. There might be a way to cut off the 0-2 Counts along the bottom, I haven't found it.

Geo?


1874-1HR-BG-16OCT2020.png

18174-1HR-BG-16OCT2020.mca
18174-1HR-BG-16OCT2020.mca
1874-1HR-BG-16OCT2020.png

 

¿ªÔÆÌåÓý

Geo,

The purpose of the background runs was to compare the 4.8 to the 32 usec peaking time with changing nothing else ¨C everything the same between the 2 runs. Set up the same, settings the same, just change the peaking time. We want to see the difference in low energy noise between the two. ?Try re-running it with identical setups.

Dud

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Friday, October 16, 2020 9:37 AM
To: [email protected]
Subject: Re: [XRF] Si-PIN Detector Background?

?

3600s Background Scan. Peaking time previously fine tuned to 4.9 us.
No rad sources or Exciter sources.
Shop made Amptek Si-PIN XR-100-CR flex-cable connected to Amptek DP-5/PC5 stack in a shop made housing. Sensor head is in a shop made aluminum lined 3/8" lead chamber/shield with a port to introduce weak tube generated microfocus X-Rays.
All the hits are 1 count, and 1 channel wide.

The first 0-2keV is cut off because of system noise. This is easy using the RANGE settings. There might be a way to cut off the 0-2 Counts along the bottom, I haven't found it.

Geo?


1874-1HR-BG-16OCT2020.png

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

 

Got it, thanks will do.

Geo

----- Original Message -----
From: Dude <dfemer@...>
To: [email protected]
Sent: Fri, 16 Oct 2020 14:11:41 -0400 (EDT)
Subject: Re: [XRF] Si-PIN Detector Background?

Geo,

The
purpose of the background runs was to compare the 4.8 to the 32 usec peaking
time with changing nothing else ¨C everything the same between the 2 runs. Set up
the same, settings the same, just change the peaking time. We want to see the
difference in low energy noise between the two. ?Try re-running it with
identical setups.

Dud

?

?

From: [email protected]
[mailto:[email protected]] On Behalf Of GEOelectronics@...
Sent: Friday, October 16, 2020 9:37 AM
To: [email protected]
Subject: Re: [XRF] Si-PIN Detector Background?

?

3600s Background Scan. Peaking time previously fine tuned to
4.9 us.

No rad sources or Exciter sources.

Shop made Amptek Si-PIN XR-100-CR flex-cable connected to Amptek DP-5/PC5 stack
in a shop made housing. Sensor head is in a shop made aluminum lined 3/8"
lead chamber/shield with a port to introduce weak tube generated microfocus
X-Rays.

All the hits are 1 count, and 1 channel wide.


The first 0-2keV is cut off because of system noise. This is easy using the
RANGE settings. There might be a way to cut off the 0-2 Counts along the
bottom, I haven't found it.


Geo?
 

Given the tiny active volume of the Si-PIN detector, I wouldn't expect a significant background count, right?

Randall

----- Original Message -----
From: GEOelectronics@...
To: [email protected]
Sent: Fri, 16 Oct 2020 09:37:12 -0700 (PDT)
Subject: Re: [XRF] Si-PIN Detector Background?

3600s Background Scan. Peaking time previously fine tuned to 4.9 us.
No rad sources or Exciter sources.
Shop made Amptek Si-PIN XR-100-CR flex-cable connected to Amptek DP-5/PC5 stack in a shop made housing. Sensor head is in a shop made aluminum lined 3/8" lead chamber/shield with a port to introduce weak tube generated microfocus X-Rays.
All the hits are 1 count, and 1 channel wide.

The first 0-2keV is cut off because of system noise. This is easy using the RANGE settings. There might be a way to cut off the 0-2 Counts along the bottom, I haven't found it.

Geo
 

Not in the normal gamma spec way of thinking but the low energy electronic system noise is a problem when using a short peaking time. And this is seen from 0 to about 2 keV.
Dud

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Randall Buck
Sent: Sunday, October 18, 2020 9:43 AM
To: [email protected]
Cc: [email protected]
Subject: Re: [XRF] Si-PIN Detector Background?


Given the tiny active volume of the Si-PIN detector, I wouldn't expect a significant background count, right?

Randall



----- Original Message -----
From: GEOelectronics@...
To: [email protected]
Sent: Fri, 16 Oct 2020 09:37:12 -0700 (PDT)
Subject: Re: [XRF] Si-PIN Detector Background?

3600s Background Scan. Peaking time previously fine tuned to 4.9 us.
No rad sources or Exciter sources.
Shop made Amptek Si-PIN XR-100-CR flex-cable connected to Amptek DP-5/PC5 stack in a shop made housing. Sensor head is in a shop made aluminum lined 3/8" lead chamber/shield with a port to introduce weak tube generated microfocus X-Rays.
All the hits are 1 count, and 1 channel wide.

The first 0-2keV is cut off because of system noise. This is easy using the RANGE settings. There might be a way to cut off the 0-2 Counts along the bottom, I haven't found it.

Geo

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