Theremino Calibration

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Mark Rowley
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Joined: 23 Oct 2015, 16:03
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Theremino Calibration

Post by Mark Rowley » 26 Dec 2015, 09:16

Hello all. I am currently running Theremino MCA with a GS-1100A and a Bicron 1.5x2.25 scintillation detector. I'm having difficulty with calibration while using Cs-137 and Lu-176. Seems that I'm consistently off by about 50keV between the Lu-176 peaks and the 661 keV cesium peak.

I've also noticed a similar issue when testing uranium ore samples. If the lead daughters are aligned, the Bi-214 peak is off about 50 as well.

Any suggestions?
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Mark Rowley
Posts: 16
Joined: 23 Oct 2015, 16:03
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Re: Theremino Calibration

Post by Mark Rowley » 26 Dec 2015, 09:21

Here's a uranium ore pic showing the calibration issue with Bi-214.
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Mark Rowley
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Joined: 23 Oct 2015, 16:03
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Re: Theremino Calibration

Post by Mark Rowley » 26 Dec 2015, 11:31

Figured it out. Had a slight issue with the Energy Linearizer. All in order now.

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Steven Sesselmann
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Joined: 27 Apr 2015, 11:40
Location: Sydney
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Re: Theremino Calibration

Post by Steven Sesselmann » 26 Dec 2015, 17:18

Mark,

Theremino does some strange things with the linearity, are you seeing the same non linear response in PRA?

if so what are the specs of your VD?

Linearity varies from detector to detector.

Steven
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

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