Nuclear Pioneer MCA RIID gamma spectrometer

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cipndale
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da cipndale » 22/01/2022, 19:30

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20/01/2022, 13:19
Compton scattering that happens inside the detector is less critical. In the situation when you make spectrum inside the lab the source is usually prepared and separated and it's not an issue to identify.
Sorry,
But that isn't the case. If that would indeed be the case, when a gamma-ray logging would be performed (that is with the detector surrounded by rock walls) there should be no Compton. Instead you add even more Compton scattering when you let the source rays pass through the dense matter and the hole effect is to swamp the peaks below 0.5 MeV in the Compton scattering. In fact, that is basically what you observe in what you have presented.
So a true statement would be: you have a lesser Compton effect when measuring a source with no obstacles (in air), but you would add far more Compton when you add obstacles in-between your detector and source. So the spectroscopy with scintillation crystals is only making sense above 1.0 MeV in thick shielding conditions.
So, in conclusion, the case you are presenting is not a case of Compton suppression, but rather a case of Compton addition.



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Matrix
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da Matrix » 22/01/2022, 20:36

Yes I'm talking about the case when source is surrounded by materials and interaction of gamma with the materials change the spectrum.
Take an active source and place it in field, like real-life stalk when it surrounded by walls / soil / metal shielding. Try to identify that source by spectra in situ and you will get only high counts of Compton continuum. You will not get the peaks, or will get partial peaks of the isotope. That's the point here. In field condition spectra can be different and hard to identify.
I place 75uCi Cs-137 behind the wall and double metal shielding, I indeed gets very high CPS, but barely growing distorted 662keV. It's a challenge for the RIID software to identify it correctly & fast in that conditions because source is shielded.

Same is for U ore. In field I get only Compton, not the classic Ra-226 peaks, but the software gets the trick to tell me about correct isotope I deal.
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cipndale
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da cipndale » 22/01/2022, 22:33

I thought you were saying that you were doing Compton removal. I must have dreamed it.



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Matrix
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da Matrix » 22/01/2022, 22:39

RIID try to identify source behind Compton, call it "remove" or not, it just works that way.


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Matrix
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da Matrix » 25/04/2022, 23:05

4.12 firmware update released.

What is new in 4.12 firmware:

Library is structured into two groups. Now you can set in the RIID f(x) menu what type of the library to use: Industrial/N.O.R.M or Medical. Selected library hint is also shown on the main display as MED or IND. IND/N.O.R.M. includes:Cs-137, Am-241, Co-60, Co-57, Ba-133, Eu-152, Ra-226, Th-232, U-235, K-40 MED includes: I-131, Lu-177, F-18(beta) and following isotopes as it also used in Nuclear Medicine for calibration or procedures: Cs-137, Co-60, Co-57
I-131 assigned to the correct Medical classification.
Fixed false positive detection of I-131 caused by Ba-133 peaks
Fixed false positive detection of Bi-214 caused by Lu-177
Start logo of the device is replaced with a smaller image to free 137kBytes of storage memory for further updates.
Added F-18 511keV to the medical library, currently in beta mode.
Added blink notification for successful identification.
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Matrix
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da Matrix » 03/06/2022, 9:01

Nuclear Pioneer variant with internally installed 10x40mm crystal coupled with Silicon Photomultiplier and pancake Geiger Sensor. Pancake tube works as an excellent combination for detecting low energy beta and alpha.
Unit is not for sell, just proof of concept.
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max56fe
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da max56fe » 15/09/2022, 17:38

hi Matrix, I wanted to know if the experimental variant is ready for sale, thanks


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Matrix
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da Matrix » 15/09/2022, 20:23

Do you mean the experimental version with Pipelined ADC? I'm still working on it.
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max56fe
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da max56fe » 16/09/2022, 7:51

I meant this - Nuclear Pioneer variant with internally installed 10x40mm crystal coupled with Silicon Photomultiplier and pancake Geiger Sensor. - when do you think the tool will be marketed ? , ciao


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Matrix
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Re: Nuclear Pioneer MCA RIID gamma spectrometer

Messaggio da Matrix » 18/09/2022, 16:49

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16/09/2022, 7:51
I meant this - Nuclear Pioneer variant with internally installed 10x40mm crystal coupled with Silicon Photomultiplier and pancake Geiger Sensor. - when do you think the tool will be marketed ? , ciao
I have in stock only the electronics, except Silicon Photomultiplier and LND Pancake. I'm not planning to import GM tube from LND INC because it expensive process for me. Unfortunately MicroFC SiPM are not available until 2023 or 2024... because of the semiconductor shortage on the market. So if you have your own MicroFC 60035 and LND tube, I can sell only the electronics boards as a Kit without sensors. Because of the SiPM shortage on the market I currently has no plan to assemble units of Nuclear Pioneer with silicon photomultiplier.


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