[ RadSafe ] Dirty Bomb -PAGs

[farbersa]

In RE: Subject: Radiation Sources at the U.S. Capitol and Library of  
Congress Buildings	 	

Zack Clayton wrote:

"....The protective action is relocation for populations exposed to 2.0 REM
first year, 0.5 REM in any subsequent year, and 5.0 REM total over 50
years exposure including the first year and subsequent years.  Skin beta
dose is allowed to be 50 times this EDE.

The unstated assumption is that there would be no relocation for
contamination levels less than those stated, so the population would be
allowed to continue inhabiting the area.  An interpretation of this
would be a cleanup standard of 2.0 REM in the first year and 0.5 REM in
any subsequent year for a continuously exposed individual."
======
Hi all:
Reading the above EPA stated guidelines for nuclear incidents, I would  
suggest that the accurate interpretation of the protective action  
guidelines from the document cited by Zack Clayton,  over a longer period  
would still require that the exposure over 50 years [including the first  
year and subsequent years] not exceed 5.0 Rem total over 50 years,  or an  
average of 0.1 Rem [100 mRem] per year over this 50 year period.

Isn't the above average of 100 mRem per year over 50 years, the correct  
average exposure from an incident and not "0.5 Rem in any subsequent year  
for a subsequently exposed individual"?.  100 mRem per year "average" over  
50 years would require that the dose from years 3 to 50 after an incident  
would have to be approximately 50 mRem/year if the initial two year  
exposure was 2.5 Rem so the 5.0 Rem total over 50 years not be exceeded.  
Right?? Any comments or thoughts appreciated.

Stewart Farber, MSPH
farbersa at optonline.net
[203] 367-0791


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