RE: Comments on NRC Soil Limits

["Abelquist, Eric" <AbelquiE@orau.gov>]

Otto-

This may be reconciled, at least to some degree, by recognizing that the
behavioral and physical parameters used in the modeling code are
conservative compared to our understanding of "real" dose from natural
Ra-226.  But again, this is consistent with how the NRC is billing these
values - as screening values, not as the values that give you the best
estimate of the true dose.

Regards
Eric Abelquist
abelquie@orau.gov

-----Original Message-----
From: Otto G. Raabe [mailto:ograabe@ucdavis.edu]
Sent: Wednesday, December 08, 1999 12:46 PM
To: Multiple recipients of list
Subject: Re: Comments on NRC Soil Limits


December 8, 1999
Davis, CA

The NRC DCGL for Ra-226 is given as:

Ra-226....................................  7.0 E-01 pCi/g

This is equal to the average natural soil concentration of Ra-226. But, we
know that we don't get 25 mrem/year from the natural Ra-226. How can this
be reconciled?

Otto

		*****************************************************
		Prof. Otto G. Raabe, Ph.D., CHP
              Institute of Toxicology & Environmental Health (ITEH)
		   (Street address: Building 3792, Old Davis Road)
		University of California, Davis, CA 95616
		Phone: 530-752-7754  FAX: 530-758-6140
		E-mail ograabe@ucdavis.edu
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