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RE: Welcome to California(
Wes,
Have you tried?:
1. To estimate activity distribution by driling
just a "few" holes.
2. To establish correlation Depth vs Absorption
(including self absorption) in the soil /
Shielding from the soil.
3.It could safe some money....
I know it can be done "easily" in the laboratory
set up, I was wondering if a some one has tried
that for the large areas monitoring....
Emil.
You wrote:
Date: Sat, 1 Jun 2002 18:49:05 -0400
From: "Wes Van Pelt" <wesvanpelt@ATT.NET>
Subject: RE: Welcome to California
Carl,
The first thing to do is state in detail the
question you wish to answer by
doing a gamma scan over a large area. By your
last sentence, it appears you
want to measure the extent of residual
contamination that produces a cancer
risk of 1 in 1,000,000. This requires dose
modeling, including ingestion of
vegetables grown on the land, drinking water from
wells, drinking cow’s
milk, breathing airborne dust, as well as direct
gamma exposure. But this is
quite easy using commonly available environmental
dose codes.
Then just equate radiation dose to cancer risk
using the Linear
Non-Threshold theory. (Please, no flames.)
The big problem, as I see it, is determining the
depth over which the
residual contamination is spread. For example,
does it go down 4 inches of
4 feet? And how is it distributed by depth? The
only way I know to determine
this is to drill holes and analyze the core
samples for radionuclide
concentration and also doing down-hole gamma
readings. This gets expensive
and requires a lot of drill holes.
Regards,
Wes
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