Re: Weighting Factor for Hot Particle Skin Doses

["Dean Chaney" <magna1@jps.net>]

Carol, I hope the statement of consideration is talking about DDE (1 cm

depth dose) to head...etc. and not SDE (0.007 cm depth), when it says its a

whole body dose.  BTW, "whole body dose," is it a whole body SDE or a whole

body DDE?   If, the dose was at the 1 cm depth then the LED, SDE and DDE

would all be the same value.



I am pretty sure that you can based the dose on the type and energy of the

radiation, and document it for NRC review and approval.  The guidance is a

fit-all guidance, but your dose estimate/record can be modified to the

specifics of the exposure and assigned.  NRC review and approval may be

necessary.



Dean Chaney, CHP

URS Corp.



----- Original Message -----

From: "Carol Marcus" <csmarcus@ucla.edu>

To: <radsafe@list.vanderbilt.edu>

Sent: Friday, January 24, 2003 11:09 AM

Subject: Weighting Factor for Hot Particle Skin Doses





> Jan. 24, 2003

>

> Dear Radsafers:

>

> Many thanks to those who have contributed to this discussion.  In reading

> the answers, I realized that I have another question.

>

> According to the Statements of Consideration for Part 20, "External doses

> to the head, trunk (including male gonads), arms above the elbow, or legs

> above the knee are to be treated as whole-body doses.  For the purpose of

> weighting the external whole-body dose (for adding it to the internal

> dose), a single weighting factor, wsubT = 1.0, has been specified."

>

> As the permissible limit for whole body radiation absorbed dose is 5 rem,

I

> assumed that if the skin of the head was irradiated, the 5 rem limit would

> apply, not the 50 rem limit.  Or, is it 50 rem shallow dose and 5 rem deep

> dose? Or something else?

>

> Ciao, Carol

>

> Carol S. Marcus, Ph.D., M.D.

> <csmarcus@ucla.edu>

>

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