Taray,

Attached is a look at the original X-ray apron file you sent (Apron Dud.jpg). This is the same as Apron 1 and is a Pb Sn construction. Apron 2 is also a Pb Sn apron.

The F7F27 .jpeg you sent is looks to be Apron 2 which is of a Pb Sn construction not Bi Sn.

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Pb La1 10.55 keV

Pb Lb1? 12.61

Pb Lg1? 14.76

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Bi La1 10.83 keV

Bi Lb1? 13.02

Bi Lg1? 15.24

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Close together lines can create interpretation problems especially in noisy low resolution data. The use of a computer pick and pre labeled lines for ID is a bad idea and even worse is a preconceived notion of what you are expecting. The data tells you what it is not the other way around. A hypothesis is great, but test and verify it.

Note that your using a 1024 channel conversion gain over an energy range of 133 keV / 1024 channels or 0.13 keV/channel.

The energy separation between Pb and Bi La1 is only 0.38 keV or 3 channels and a Si detector has a FWHM resolution of about 0.250 keV at the Pb La1. The Si detector efficiency falls off very rapidly above 30 keV or so it would make better sense to calibrate 0 to 66 keV using a 2048 conversion gain. That would give you 0.03 keV/channel and allows you to do a AM-241 cal check as well.

I’d also recommend doing longer count times to better define the peaks and to see the confirming lower yield peaks.

Dud

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From: [email protected] [mailto:[email protected]] On Behalf Of taray singh via groups.io
Sent: Tuesday, September 29, 2020 4:22 AM
To: [email protected]
Subject: Re: [XRF] Si pin xrf ..1st go

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Here is the x ray apron file.
Taray