[ RadSafe ] 10CFR20 question

Carol Marcus csmarcus at ucla.edu
Wed Jan 21 17:16:12 CST 2015

Dear Gretchen:

My understanding is that it works like a body badge.  If you could 
reasonably expect to get more than 10% of the 5 rem limit, NRC requires 
a body badge.  Many institutions require a badge for everyone in order 
to protect themselves in the event of a lawsuit, but NRC doesn't require 
this.  If your activity could reasonably result in an extremity dose 
greater than 10% of the extremity limit, then you need an extremity 
badge.  Technologists who inject radiopharmaceutical doses, nuclear 
pharmacists, and nuclear pharmacy techs are examples of people who 
commonly wear extremity badges (finger rings).  It is often a judgment 
call by the RSO.

Carol S. Marcus, Ph.D., M.D.
Prof. of Radiation Oncology, of Nuclear Medicine, and of Radiological 
David Geffen School of Medicine at UCLA

On 1/21/2015 2:09 PM, Gretchen Mitschelen wrote:
> Hi-I am a student at U of M and am taking a lab that requires I familiarize
> myself with 10CFR20 (among other things!)
> My question is this:
> Under what circumstances, if any, is the use of extremity monitoring
> required under NRC regulations?
> I found in 10CFR20.1502 (a) the circumstances that require and individual
> to monitor for external dose, but can't seem to find anything that deals
> solely with extremity monitoring.
> Any help is appreciated!
> Thanks-

More information about the RadSafe mailing list