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Re: The "right" answer
Depends on how you average the dose! Those "average" doses that give
numbers in the microrem for dental exposures take an exposure to the jaw
and average it over the whole body. This method can ONLY be true if
dose response over the whole body is exactly linear all the way down to
zero - thus LNTH. Not much different than population dose in person
rem!
John Jacobus wrote:
>
> Ted,
> The skin is fairly radioresistant. See Pages 325-327
> in http://www.nap.edu/catalog/1224.html Information
> on thyroid cancers in this group is on pages 283-286
>
> The tissue weighting factors are 0.01 for skin and
> 0.05 for the thyroid.
>
> I do not understand your last paragraph. How does
> average doses presuppose the LNT? The dose to organs
> is usually in dose equivalent values, not the
> equivalent dose.
>
> --- Ted de Castro <tdc@xrayted.com> wrote:
> > Also - considering the output and energy of a Grenz
> > Ray machine the skin
> > dose was surely much higher. I would assume the
> > bulk of the cancers
> > were probably skin cancers in the affected area -
> > but I don't know this
> > for sure - clarification would be appreciated.
> >
> > Using average dose as meaning anything at all
> > presupposes LNT to be
> > correct. Especially in SI units - which are risk
> > based and have little
> > meaning without LNT.
> > . . .
>
> =====
> -- John
> John Jacobus, MS
> Certified Health Physicist
> e-mail: crispy_bird@yahoo.com
>
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