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From: "Dirk Bruere"
Subject: Re: Any ideas on measuring radiation in the home ?
Date: Fri, 4 Oct 2002 06:14:22 +0100
References: <0I1YkqBZoKm9Ewbi@jmwa.demon.co.uk> <firstname.lastname@example.org> <email@example.com> <3D9A8849.C28104D9@webaccess.net> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <8YwawTCIeKn9EwTq@jmwa.demon.co.uk>
Reply-To: "Dirk Bruere"
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"John Woodgate" wrote in message
> I read in sci.electronics.design that The little lost angel overgirl.lrigrevol.moc.com> wrote (in <email@example.com
> t.sg>) about 'Any ideas on measuring radiation in the home ?', on Thu, 3
> Oct 2002:
> >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
> >Erm, wouldn't that imply soil is dangerous or is that supposed to be
> >depleted Uranium?
> 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
I made the original estimate assuming soil to a depth of 1m, a soil density
of 4 tonnes per cubic metre and Uranium at a concentration of 2ppm.
That means we have 4,000,000 tonnes per sq km and 8 tonnes of Uranium.
Obviously some regions have more Uranium that others.
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