Sensitivity of Scionix Holland Gamma Scintillation Detector NaI(Tl) 38mm probe & others

Scintillation crystals, PMTs, voltage dividers etc...
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ChrisqMalibu
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Sensitivity of Scionix Holland Gamma Scintillation Detector NaI(Tl) 38mm probe & others

Post by ChrisqMalibu » 13 Mar 2022, 08:15

Hi all,

My very 1st question here. Is there any sensitivity data similar to below for Scionix Holland Gamma Scintillation Detector NaI(Tl) 38mm & other probes used with GS-Pro-USB?

https://www.geigerzaehlerforum.de/index ... 642.0.html
******Maybe a comparison of the sensitivity of the ATOM FAST vs. various standard counter tubes:
ZP1401/LND-712 65 pulses/µR (18 cps/mR/h, Co-60)
SBM-20 78 pulses/µR (Cs-137)
BETA-1-1 96-144 pulses/µR ( Co-60)
SBM-19 310 pulses/µR (Cs-137)
SBT-10 362 pulses/µR "
SI-22G 540 pulses/µR "
AF 4*7*35 1700 pulses/µR "
Radiacode-101 ~2250 pulses/ µR
AF 8*8*50 4700 Imp/µR "
Radiation Pager 7560 Imp/µR per https://www.geigerzaehlerforum.de/index ... 642.0.html

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Sesselmann
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Re: Sensitivity of Scionix Holland Gamma Scintillation Detector NaI(Tl) 38mm probe & others

Post by Sesselmann » 14 Mar 2022, 12:30

Chris,

The sensitivity or efficiency of an NaI(Tl) detector is a function of the crystal size and gamma energy, so it depends very little on what instrument you use to count the pulses. Typically an encapsulated 1.5" NaI crystal will have an absorption efficiency of 60% at 662 keV., this efficiency falls of as the energy increases.

The best way to calibrate for exposure would be to use a calibrated source, and always be aware that the software like PRA will literally drop counts when the count rates go above 2500 cps., so it is not recommended as a safety device.

Steven

ChrisqMalibu
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Re: Sensitivity of Scionix Holland Gamma Scintillation Detector NaI(Tl) 38mm probe & others

Post by ChrisqMalibu » 15 Mar 2022, 04:00

Thank you for your insight, Steve. I use Atom Fast 8850 https://www.facebook.com/pg/Atomfastscint/posts/ as dosimeter because of its CsI 8mm x 8mm x 50mm Crystal Scintillator. The max rate count is 10,000 cps. Energies of gamma- and X-rays detected: 60 keV - 10 MEv min. Energies of beta-radiation detected: 500 kEv and higher. Sensitivity anisotropy, Cs137: 30% max. Dose rate measurement range: 0,01 uSv/h – 100 uSv/h (1 uR/h – 10 mR/h).

Now, I'm testing GQ GMC-600 Plus for a quick food/water inspection following by GS-USB-PRO + probe to check spectrum for nuclide identification. Eventually, I'll learn how to build my own probe (I'm an electrical engineer). For now, I'm rushing to set up myself in California and 2 of my younger brothers in Thailand to have ways to check food/water for radioactive contamination (just in case of nuclear accident in Ukraine).

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