Re: 10CFR20 mistake?

[Michael McNaughton <mcnaught@LANL.GOV>]

At 08:52 AM 4/5/01 -0400, you wrote:

>20.2202 (a)(1)(iii) "A shallow-dose equivalent to the skin or extremities

>of 250 rads(2.5 Gy)..."

>Note the units used here for shallow-dose equivalent. It is the same in

>earlier editions of 10CFR20. In (b)(1)(iii) the units are in rems (Sv).



IMHO, the use of Gy for shallow dose is appropriate but the word 

"equivalent" should be omitted.

However, there is an underlying important point as follows.



There is a major ambiguity that I think our profession should clarify:

the Sv might or might not include the tissue-weighting factor!

Of course we know that one is "effective dose equivalent" and the other is 

"dose equivalent"!

But these are very different quantities and it is confusing to use the same 

units.



Mike McNaughton, Los Alamos, mcnaught@lanl.gov

Mike McNaughton

Los Alamos National Lab.

email: mcnaught@LANL.gov or mcnaughton@LANL.gov

phone: (505)667-6130



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