LB Se PAA Horse Feed Experiment

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Revision as of 04:28, 3 May 2017 by Brenleyt (talk | contribs) (Created page with "== Irradiation of Horse Mineral Supplement== Below is the EMSL report for the horse feed sample. https://wiki.iac.isu.edu/index.php/File:EMSL_Report_Horse_Feed.pdf === Chlorine…")
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Irradiation of Horse Mineral Supplement

Below is the EMSL report for the horse feed sample. https://wiki.iac.isu.edu/index.php/File:EMSL_Report_Horse_Feed.pdf

Chlorine is a dominant signal

First, look at the peak around 146 keV 146 keV.png

Next I plotted the counts as a function of time to get an exponentially decaying graph. When doing an exponential fit here, the parameter "b" given by root will be the decay constant.

Chlorine.png

Root gives a half life of 32.9508 +/- 0.01 minutes


Now do the same for the 2127 keV line 2127 keV.png

Here are the counts plotted as a function of time 2127.png

Root gives a half life of 35.3962 +/- 0.2 minutes

Potassium is a potential signal

Looking at the spectrum for the fast irradiation sample, there are 2 prominent lines that could be from 38-K. The mechanism would be a single neutron knockout from a stable 39-K nucleus. The two most dominant energies of the three for 38-K are 2167 keV and 3936 keV and the half life is 7.63 minutes. Below is a fit to the energy spectrum histogram

2168 peak.png

Now check the half life


2167.png

Root gives a half life of 8.03 +/- 0.02 minutes

Next check the 3936 peak

3937 Peak.png

and check the half life

3936 keV halflife.png

Root gives a value for b = - 1.14372x10^(-3), which in turn gives a half life of 10.1 minutes

It seems very possible that 38-K could be in the sample of horse feed.