Here are a couple of in-situ spectra taken with a 1 cc CdZnTe detector over lands contaminated by Chernobyl in Belarus.
Detector unshielded, suspended 1 m over the surface. Fairly standard Cs-137 spectra but a nice resolution from the detector even though its very small and not as efficient as a larger NaI or whatever.
All natural isotopes drowned out by the strength of the signal from the Cs-137.
Lars
In-situ CdZnTe Spectra from Belarus
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Lposter
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In-situ CdZnTe Spectra from Belarus
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Sesselmann
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Re: In-situ CdZnTe Spectra from Belarus
Lars,
Thanks for posting, very satisfying resolution on those CZT detectors.
Steven
Thanks for posting, very satisfying resolution on those CZT detectors.
Steven
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Alain
- Posts: 22
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Re: In-situ CdZnTe Spectra from Belarus
Hi Lars,
extremely intersting :) From many travelers I've heard that in Belarus are extreme tight laws and rules and you certainly don't dare to smuggle out even a gram of such soil. But it would be interesting to know, if you have any data about specific activity (Bq/kg) of specific surface activity (Bq/m2) of soil at the place, where you have done spectra recording?
extremely intersting :) From many travelers I've heard that in Belarus are extreme tight laws and rules and you certainly don't dare to smuggle out even a gram of such soil. But it would be interesting to know, if you have any data about specific activity (Bq/kg) of specific surface activity (Bq/m2) of soil at the place, where you have done spectra recording?
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Lposter
- Posts: 31
- Joined: 13 Jan 2018, 08:01
Re: In-situ CdZnTe Spectra from Belarus
Hei Alain
Belarus has adopted a different approach to Ukraine in their management of contaminated sites and are somewhat stricter.
I did recording near the Ukrainian border about 15 km from the plant itself. The deposition is very heterogenous and varies wildly over short distances. Densities about 1.4 MBq/m2 137Cs are the sort of levels that can be found. If you assume that is taken from the top 10 cm of soil and the density is 1 g/cc, then that would be 100 cm by 100 cm by 10 = 100 000 cm3 or 100 kg. Which would be of the order of 14 kBq/kg or thereabouts I think? I have no idea what it was at the exact spot I took a spectrum from.
I was hoping perhaps to see 241Am as that is ingrowing from deposited Pu (its at levels of 100 kBq/m2 nowadays) but the lower end of the spectrum was very messy. From scattering I assume?
P
Belarus has adopted a different approach to Ukraine in their management of contaminated sites and are somewhat stricter.
I did recording near the Ukrainian border about 15 km from the plant itself. The deposition is very heterogenous and varies wildly over short distances. Densities about 1.4 MBq/m2 137Cs are the sort of levels that can be found. If you assume that is taken from the top 10 cm of soil and the density is 1 g/cc, then that would be 100 cm by 100 cm by 10 = 100 000 cm3 or 100 kg. Which would be of the order of 14 kBq/kg or thereabouts I think? I have no idea what it was at the exact spot I took a spectrum from.
I was hoping perhaps to see 241Am as that is ingrowing from deposited Pu (its at levels of 100 kBq/m2 nowadays) but the lower end of the spectrum was very messy. From scattering I assume?
P
