[ RadSafe ] Re: First Ever Intentional Hormetic X-Ray

[BLHamrick at aol.com]

In a message dated 4/20/2005 5:59:27 A.M. Pacific Standard Time,  
crispy_bird at yahoo.com writes:

Recently,
you have EPA requiring remedication to 25 mrem  annual
exposure limits.  From the most serious hazards to  the
truely trivial.



Actually, EPA's proposed guideline was 15 millirem per year, some years  ago. 
 That position has been rescinded, and they tend to bristle (in my  opinion) 
at any use of dose as a criterion for remediation.  The official  message now 
is that risk, not dose is the appropriate measure for remedial  actions 
(although how you get any risk without dose is beyond me).  CERCLA  regulations 
recommend remaining within the risk range of 1E-6 to 1E-4 increased  cancer risk 
over a lifetime, or in very generic terms (which the EPA also has  pooh-poohed) 
about 0.05 to 5.0 millirem per year.
 
Barbara L. Hamrick