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Radon profiles in the ground/soil
I just picked up the two year old note by Chris H. from our archives. I
wonder if anyone can give published references to radon 222 level data for
different depths and for various types of soil (gradient description). The
context is "radioprotection of the environment". As examples I wonder what
an earthworm say at a depth of 10-20 cm may be exposed to or a mole in the
hole that is 50 cm below the surface. The context extends to radiation
sensitivity data for bats (references). Any hints will be appreciated.
My personal initiative only,
Bjorn Cedervall bcradsafers@hotmail.com
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Radsafers,
Radon concentrations a metre or so below the ground surface are
typically a thousand times higher than in the air above ground, so there
are concentration profiles due to diffusion out of the ground, which
ensure continuity. Where there is an effective barrier to diffusion,
like below a concrete basement, the concentration there builds up to a
high equilibrium value, so that even small openings or cracks can cause
an elevated concentration inside, compared with outdoors, particularly
if the ventilation is poor.
Ploughing would disturb the concentration profiles in the top soil
layers and temporarily cause a faster release of radon gas until a new
equilibrium has been established. According to e.g. IAEA definitions,
should farming therefore be classed as a practice, and the farmer a
potential radworker?
Chris Hofmeyr
chofmeyr@nnr.co.za
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