Re: Natural Thorium

["Robert Denne" <rdenne@worldnet.att.net>]

The DOT lists the specific activity for all of the Th isotopes including a
listing for ThNat.  The specific activity listed is 2.2e-7 Ci/g (8.1e-9
TBq/g).  It is my understanding that this is based on the secular
equilibrium.  I'd like to know how that calculates out.
----- Original Message -----
From: Elizabeth Algutifan <elizabeth_algutifan@wssrap-host.wssrap.com>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Sent: Wednesday, May 26, 1999 6:46 AM
Subject: Natural Thorium


> This is a question of semantics: What does the term "natural thorium"
really
> mean? A geologist colleague of mine came up to me this morning and asked
me to
> tell him the specific activity of natural thorium. As I got to thinking
about
> it, it occurred to me that if natural thorium is only referring to the
thorium
> isotopes in the decay chain, I can calculate it based on assuming secular
> equilibrium between Th-232 and Th-228 (and say they both contribute half
to the
> total nat Th activity). Is that an oversimplification?
>
> Elizabeth Algutifan
> Elizabeth_Algutifan@wssrap-host.wssrap.com
>
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