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Re: [Know_Nukes] Re: Rads/rems (formerly radiographer "overexposure")
Jim,
What I was saying (if I remember that far back) is
that critial exposures are usually evaluated as having
cutoff associated with such erythema, hemopoietic
syndrome, GI syndrome and neurological syndrome. The
response manifest itselfs as an easily observable,
clinical response. Certainly, cancer risks may
increase in those who receive high doses, but that is
not what you are concerned about. However, are the
tissue weighting factors the same for high dose
exposures as low dose exposures? Again, the only way
is to have a large number of people irradiated, but it
is so hard to get volunteers for high dose, whole body
irradiations.
I think it is interesting that the number of A-bomb
survivors with high exposures was really not that
large. In fact the average exposure was only about
200 mSv,
http://www.rerf.or.jp/eigo/faqs/faqse.htm#faq11. In
this case, I assume that mSv refers to the dose
equivalent and not the effective dose. (Since the DE
and ED are both in Sv, this further adds to the
confusion. That is why I like the rad or Gy.)
I hope I am helping and not further confusing the
issue. On many issues, I am learning myself.
--- Jim Hoerner <jim_hoerner@hotmail.com> wrote:
> >From: Fischer, Karl (NIH/OD/ORS)
> [mailto:fischerk@o...]
> >Sent: Tuesday, July 29, 2003 11:16 AM
> >To: 'radsafe@list.vanderbilt.edu'
> >Subject: Rads/rems (formerly radiographer
> "overexposure")
> >
. . .
>
> Paul, thank you for this great information I was
> unaware of. Can you or
> anyone else elaborate? What does one do beyond 10
> Rad? Are 200 Rad of
> gammas and neutrons equivalent? I suspect not.
>
> John J., I read your post. I am confused. Not by
> what you wrote; but by
> the apparent contradiction that I see. If health
> effects at low doses are
> extrapolated from high doses (~10 Rad and up), how
> can the Q factor not
> apply at high doses as well?
>
> Please help me to understand this.
>
. . .
=====
-- John
John Jacobus, MS
Certified Health Physicist
e-mail: crispy_bird@yahoo.com
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