[ RadSafe ]" EPA Tritium Risk Plan"

[Chris Alston]

Yes.  E.g., in the medical community, there's increasing concern that mammographic x-rays (27 kVp) may be a factor of four, or greater, more effective at inducing Ca than, say, 200 kVp photons.  It's possible that this could affect the recommendations for screening mammography.

Radsafers 
It is "well known" that tritium and other radionuclides that emit low energy 
electrons and photons have a higher risk per unit dose than the "standard" 
250 kVp X-rays, but than so does lower energy X-rays, and higher energy 
electons and photons have lower risks. We did a large animal experiment at 
CRNL to test this. 


The ICRP, NCRP, etc have decided that a single radiation weighting factor of 
unity is adaquate to represnt the risk from all this radiation, given the 
large uncertainty in the risk. 
Is there new information that is "leading" the EPA to change this titium 
weighting factor? 
John R Johnson, PhD 
CEO, IDIAS, Inc. 


Cheers
cja


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