Re: thorium nitrate

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#569

From: Raymond A. Rogoway
Date: Tue, 28 Feb 1995 05:59

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Thorium nitrate was used in a Project Physics experiment, entitled Half-Life.
The isotope that is isolated is Thallium-208. The Thorium nitrate is treated
with a nitric acid solution and pour through an ammonium phosphomolybdate (love
that word) slurry. The Thallium-208 adsorbs and is counted w/a geiger counter
(which counts geigers?). Th-208 has a half-life of 3.1 min so students can
measure multiple half-lives during a period.
I have done the experiment for a number of years and it works well. However,
disposal in today's envirorisk society is getting to be a problem.

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Ray Rogoway
Independence High School
fax: (408) 926 6785

The words are lovely dark and deep
but I have promises to keep
and miles to go before I sleep and
miles to go before I sleep.

AOL:      rayrogoway@aol.com
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          rrogowa@cello.gina.calstate.edu
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Date: Tue, 28 Feb 1995 00:59:55 -0500
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From: "Raymond A. Rogoway" <rrogowa@cello.gina.calstate.edu>
Subject: Re: thorium nitrate
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