RE: Iodine 131

["Lieskovsky, Miro" <MLieskovsky@nbpower.com>]

Ron,
Chart of The Nuclides, 15Ed., 1996, gives 235U Fission Yield at 2.89%.  What
is your reference?

The beta minus precursors (131In, Sn, Sb, Te) have relatively short
half-lives when compared to that of 131I.  This is why the core inventory
activity (steady state) of 131I is in a 'larger' value.

Miro  

-----Original Message-----
From: Ron L. Kathren [mailto:rkathren@tricity.wsu.edu]
Sent: Saturday, August 19, 2000 3:32 PM
To: Multiple recipients of list
Subject: Re: Iodine 131


I-131 is prduced both as a direct fission product and from ingrowth from
Te-131 and precursers.  The total fission yield is a relatively high 5.4%.
As it is constantly being produced by the fission process, there will be a
considerable amount in an operating nuclear reactor.  However, when the
reactor  is shut down, the I-131 will decay with its characteristic
half-life of 8.05 days, and after a few months there will be relatively
little I-131 remaining in the spent fuel.

Ron Kathren


----- Original Message -----
From: Steven Dapra <sjd@swcp.com>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Sent: Friday, August 18, 2000 9:13 PM
Subject: Iodine 131


> Aug. 18
>
> What is the source of the vast quantities of I-131 that is produced in
> power reactors, and why is there so much of it?
>
> Steven Dapra
> sjd@swcp.com
>
>
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