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From: John Woodgate
Subject: Re: Any ideas on measuring radiation in the home ?
Date: Thu, 3 Oct 2002 21:24:40 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 3 Oct 2002 21:40:04 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that The little lost angel wrote (in <firstname.lastname@example.org
t.sg>) about 'Any ideas on measuring radiation in the home ?', on Thu, 3
>On Thu, 3 Oct 2002 15:11:48 +0100, "Dirk Bruere"
>>Has more of a use as ballast in ships and aircraft.
>>BTW, ordinary soil contains some ten tonnes per sq km of undepleted Uranium.
>Erm, wouldn't that imply soil is dangerous or is that supposed to be
No, it must be undepleted. Depleted U is a man-made product. Undepeleted
U is over 99% U238, which is a very long-life nuclide (4.5 billion year
half-life) and emits alpha-particles, which have only a short range (a
few cm). The emissions from soil in most non-mountainous areas are less
than those from cosmic rays, AIUI. Also, remember that we *evolved* in
this environment; it isn't anything new.
I think that '10 t/sq km' makes an assumption about soil depth. The
abundance should be expressed in tons/cubic km. A cubic km of soil is
kinda heavy, like 4 billion tons, and Kaye and Laby gives the abundance
of U as 1.6 parts per million in crustal rock, from which soil is
derived in most parts of the world. 6400 t is a very small proportion of
4 billion t. There may be about 8 t of gold in there too, but just try
to find it.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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