Re: I-131 Thyroid Uptake

[LIPTONW@dteenergy.com]

ICRP 30, which is the basis for 10 CFR 20, quotes states that 30% of inhaled 
iodine is translocated to the thyroid, while the remainder, "...is assumed
to 
go directly to excretion..."  This value will vary, especially for
individuals 
with thyroid disease.   
 
The opinions expressed are strictly mine. 
It's not about dose, it's about trust. 
 
Bill Lipton 
liptonw@dteenergy.com 
 
You wrote: 
 
>Does anyone have references to suggest for answers to the following
questions: 
 
>What is the typical percent of a iodine intake (we happen to be concerned 
with I-131) >that will be taken into the thyroid gland?  My 1972 copy of 
Shapiro, "Radiation >Protection" says 30%, but there is some indication that 
it may be as low as 3% (at >least for some individuals) according to other 
sources. 
 
>So, is the answer a range, say about 3 to 30%?  Does the pathway make a 
difference, >e.g. nuclear medicine injection vs. reactor release and 
subsequent accidental >inhalation? 
 
>Thanks, 
>Mike McCarty 
>Health Physicist/Emergency Planner 
>mccartmj@state.mi.us 

************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html