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SWARREN/1ma/rme
BM SW
June Mh, 1948
President Kari %. Goupten
Kasesabusctts Institute of Testnclegy
Gendridge, Ratcasimsctts
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Bear Dr, Gomptens
your letter ef June 7, in waleh ay opinion regarding the Pikial:
reeurvey is quoted. I have not seem, as far as I enn reeall, either
the euumary of the Mixiai repert oy Iv. Gifilian's repect.
ad
reeall talking vith Dr, Gi1filien about general peizte
to madiation dose levels. I¢ is my feeling that the safe level
for continued exposure to fonisiag radiation is fa the range fron
lua ‘
05 - .lr per day, with a permissible total of Sy in any one veek,
os
«e have very little factual date ae te the offeetes ef a single
expomre or ehroaic exposures to larger amounte of radiation. Ve
know that as little as 12 or 15r may produce in humane demonstrable
changes in the lymphocyte, If I had te, I would be willing to teke
an expogure of this order and not think much ucre eof {t. It is
prodatle that an individual reosiving e careful %-ray ateady of Dis
gastrointestinal trast takes up to 15r ever his trunk which is that
nart ef the body where moet of the Blood forming activity is carried
On,
I feel keenly the responsibility fer nalataining permissible levels
for radiation that we knov to be safe. As eur knoviedge afvances,
it day be possible to extend these linits somewhat werd.
.
Youre sincersiy,
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Daviston ef Biology
and Redicine
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MEDICINE, HEALTH & SAFEIY
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DATE!
6/2348
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