questions

[SWEIS <sweis@roadrunner.com>]

For all you radafers' out there, especially the members with a broader
knowledge base.
For the Los Alamos Site-Wide ESI we are looking at special pathways of
exposure. One of the special pathways is the possible dermal absorption of
contaminates, hence the following question to the Radsafe community.

Has anyone come across or know of dermal absorption coefficients for
actinides or heavy metals or calculated radiological doses for the dermal
exposure pathway.

The only reference that I have found to date that comes close is from
EPA/600/8-91/011B, and this only deals with tritium. Logically, a transfer
coefficient for heavy metals should be extremely small, however we need a
citable reference/methodology. Use of EPA default absorption coefficient may
not be feasible.

Another question that has been posed to me is: Is there a weighting factor
assigned for extremities? The US regulatory authorities and ICRP's that I
know of do not assign any. Does anyone else out there have knowledge of an
extremity weighting factor that can be cited.

How should radiological doses be formed for inhalation of radionuclides
during smoking of plant materials? 

If you have thoughts on the above subjects or a real answer, please contact
me directly at:

Robert Monsalve-Jones
GRAM Inc.
974 17th Street
Los Alamos, NM 87544
telephone (505) 661-6700
fax            (505) 661-6705
e-mail       sweis@roadrunner.com

Thanks in advance.