Re: thyroid and TB exposure for a I-131 medical treatment

["Ron L. Kathren" <rkathren@tricity.wsu.edu>]

The dose conversion factor for I-131 for thyroid is 6.3 (some say 6.4)
rads/microcurie for a euthyroid individual with 20% uptake.  Hence for 22.9
mCi (a therapeutic dose) the total lifetime dose is about 150,000 rad
(actually 144.3 krad) to the thyroid.  For a normal euthyroid individual,
the effective half life is about 7.5 days.  For a hyperthyroid individual,
this could be smaller, and hence the dose to the tyroid would also be
smaller.  Consult the MIRD publications for more detailed data.

Ron Kathren


-----Original Message-----
From: Eric_Dilandro@vapower.com <Eric_Dilandro@vapower.com>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Date: Tuesday, October 19, 1999 3:50 AM
Subject: thyroid and TB exposure for a I-131 medical treatment


>
>
>Could anyone tell me the total body and thyroid exposure for 22.9 mCi of
I-131,
>also I am looking for the biological 1/2 life.
>Is there a web site out there that would perform this calculation?  How
about a
>web site with a list of biological 1/2 lives.
>
>
>
>
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