Pa-234 and -234m Specrtra

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Steve Dubyk
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Pa-234 and -234m Specrtra

Post by Steve Dubyk » 22 Jun 2015, 04:04

Attached is a simple experiment to expose the weak and reclusive spectra from Pa-234 and Pa-234m, the later being a key indicator of the presence of U238.

Steve Dubyk
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Pa234 gspec v2.pdf
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pietkuip
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Re: Pa-234 and -234m Specrtra

Post by pietkuip » 22 Jun 2015, 08:37

I have not looked into Theremino yet, but I find the statistical noise in those curves a bit strange. In the last spectrum in the .pdf, that 1001 keV seems a bit too narrow for a NaI detector.
Pieter Kuiper, Växjö (Sweden)
Course lab: 3 mCi neutron source; five 3" NaI(Tl) detectors, CdZnTe detector (Amptek); lead bricks, two GDM 20

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Steve Dubyk
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Re: Pa-234 and -234m Specrtra

Post by Steve Dubyk » 22 Jun 2015, 09:36

Pieter, thank you for noticing that, I did also. The Theremino program uses a recursive deconvolution algorithm and I suspect that is the reason for the unusually sharp peak at 1001 keV and also the noise. Additionally, I reduced the peak equalizers in the program for all energy levels other than the 1 MeV range, so that likely affects the graph also.

Steve Dubyk

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