carcinogenic risk from external exposure to radionuclides in streams/lakes

["Henry Wood" <thenry@viperlink.net>]

EPA's Office of Radiation and Indoor Air compiles the HEAST Table 4 that
provides carcinogenic slope factors for external exposure to rads in soil. 


Has anyone developed an equivalent listing of carcinogenic slope factors if
the source is a waterbody?   
I am interested in quantifying exposure due to submersion (swimming) as
well as from non-swimming activities (eg in a boat, or wading on the margin
of the stream).  I assume that the attenuation due to water eliminates most
concerns with external radiation while boating or wading?

Thanks for any input,


Thomas Henry Wood
Blue Ridge Environmental Consulting, Inc.
600 Highway 25 North
Travelers Rest, SC  29690
864-834-5513
thenry@viperlink.net
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