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Re: soil samples
Brian
In response to your questions
1.
>Specific radiochemical techniques to look at H-3,
> C-14??? I do not expect to see these types of radionuclides in this
sample.
You will see H-3 and C-14 in soil because they are produced in air from
cosmic ray interactions and are globally distributed from bomb tests. RC
techniques are not very sensitive because they do not seperate out the
radioactive isotopes. LS counting is the cheapest but again the sensitivity
is poor. Mass spectroscopy is expensive but the sensitivity is very good.
2.
> What activity level is clean?
>
A very difficult question! I would say 3 sigma above background. Background
level can be found in the UNSCEAR reports (UNSCEAR 2000 is available from
the UNSCEAR's website
John
IDIAS, Inc
4535 West 9th Ave.
Vancouver, B. C.
V6R 2E2
(604) 222-9840
idias@interchange.ubc.ca
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