Re: I-125

["Wesley M. Dunn" <WDUNN@brc1.tdh.state.tx.us>]

I guess I took a different approach to this.  Texas long had release 
limits similar to the current DOE standard.  We couldn't justify 
leaving the iodines in with the transuranics and other nasties, so we 
removed them (except for I-129).  The release limits for the other 
iodines are now the same as for other beta-gamma emitters (which is a 
factor of 5 higher).

Having a such a strict release limit for something with such a 
short half-life just doesn't seem to make any sense -- so we fixed it.

Reference: Texas Regulations for Control of Radiation Appendix 21-G.

Wes

>On 1/28/97 Larry R. Sanders wrote, in part:
>      
>Can anyone tell me where the 300 dpm limit for releasing of I-125 
>contaminated material came from, or the basis for this limit? It 
>seems I-125 and I-129 require the same release limit as Ra-226, 
>Ra-228, Th-230, Th-228, Pa231, and Ac-227. Other isotopes from Iodine 
>have a significantly higher release limit.  
>
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Wesley M. Dunn, CHP                        512-834-6688
Deputy Director, Licensing                 512-834-6690 (fax)
(Texas) Bureau of Radiation Control        wdunn@brc1.tdh.state.tx.us
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