HPS 13.10 S-35 & C-14 values

[eh_carbaugh@ccmail.pnl.gov]

The following information is forwarded from Jay MacLellan (ja_maclellan@pnl.gov)
in response to the RADSAFE queries.  Please respond directly to Jay with 
questions because he is not a RADSAFE subscriber.

        Gene Carbaugh  (eh_carbaugh@pnl.gov)



The selection of the MTLs are discussed in Appendix C of HPS N13.30.  The 
original testing ranges were set at multiples of 3 and 30 times the acceptable 
minimum detectable activities  (AMDAs) of the early drafts of the standard.  The
AMDAs, which are no longer a part of  the standard, were for the most part set 
at the "Limits of Detection" given in ICRP 10. Because the ICRP 10 values for 
S-35 and C-14 differed by a factor of 100, the MTLs differ by a factor of 100.  
Although HPS N13.30 was recently published in its final form, much of the text
was written over 15 years ago.  Future revisions will incorporate more recent 
references.

Jay MacLellan, Secretary
HPS Working Group 2.5  (HPS N13.30)