From: John Woodgate
Subject: Re: eer
Date: Tue, 29 Oct 2002 03:54:44 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Tue, 29 Oct 2002 06:01:59 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that StevJensen
wrote (in <email@example.com>) about 'eer', on
Tue, 29 Oct 2002:
>As far as I know most of this stuff decays in days to years. Not the millions
>of years I seem to hear about. And if it does take millions of years is
>it really meaningful to call it radioactive in the first place. After all the
>hydrogen in water is supposed to have a half life (and thus be "radioactive").
Most fission products have half-lives from seconds all through tens of
thousands of years, with just a few having longer times (Tc97, Tc98 for
example). It is many of the naturally-occurring isotopes, and some
natural decay products, that have half-lives over 10^6 years.
Hydrogen in water is NOT radioactive, neither H1 or H2 (deuterium, D).
You may have read about man-made tritium T (H3) being released into the
sea. T is radioactive; it's a low-energy beta (electron) emitter with a
half-life of 12.3 years. Betas are stopped by simple shielding, so T is
not very hazardous in small quantities, but it is mutagenic in sea-life.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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