Re: radiation and brain

[Dan Burnstein <npro1@ziplink.net>]

S. Julian Gibbs or anyone,

What is the dose rates for these three populations whose central nervous
system is affected?  I am wondering if it less than 25-50R, which is the
level below which some health physicists and nuclear engineers says is safe
and even beneficial under the name of homesis ?

confused,
Dan B.


"Gibbs, S Julian" wrote:

> Known radiation effects on the central nervous system are:
> 1.  Interference with growth and development from exposure
> in utero.  Japanese a-bomb survivors exposed before birth
> show decreased mental function, lower IQ, microcephaly
> (small head) and short stature. Maximum sensitivity 8-15
> weeks post coitus.
> 2.  Brain tumors years to decades post exposure.  First
> seen in excess incidence in children whose scalps were
> irradiated for tinea capitis (ringworm of the scalp) when
> they emigrated to the new Israel in late 40s.
> 3.  Cataract, following large doses.  Threshold dose about
> 1 Sv acute exposure, greater with protracted exposure.
>
> A good readable reference is E.J. Hall, Radiobiology for
> the Radiologist, ed 4, Lippincott 1994.
>
> ***********************************************************
> S. Julian Gibbs, DDS, PhD               Voice: 615-322-3190
> Professor of Radiology                    FAX: 615-322-3764
> Dept. of Radiology & Radiological Sciences
> Vanderbilt University Medical Center
> Nashville TN 37232-2670        Email:j.gibbs@vanderbilt.edu
> ***********************************************************
> Tell me and I forget; teach me and I remember; involve me
> and I learn.
>                        --Chinese proverb
>
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