Re: RADSAFE digest 3135

["Sandy Perle" <sandyfl@earthlink.net>]

> The "transit exposure" was determined by using the "control" TLDs,
> one of which was kept in a lead shielded box during the 90-day exposure
> period.  That corrected for the exposure during transit and storage.

Don,

Thanks for the information. The only dose other than background 
should have been the transit dose, depending on the distance from 
the NRC lab RT to the monitoring point. The clarification that the 
dose reported was net is appreciated. That net dose is still 
essentially the natural background in the area.

Keeping a "control" in a lead safe in some cases can cause a 
problem. I've observed facilities keeping their controls in a lead 
safe, and those controls actually had a higher dose than the 
personnel doses received by the staff. I'm sure that the NRC facility 
did characterize the safe to ensure that it was "contamination free".

Regards,
----------------------------------------------------------------------------------
Sandy Perle					Tel:(714) 545-0100 / (800) 548-5100   				    	
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