~ 27 =
At the present writing the exposure of humans in the U.S.A. to penetrating external gamma radiation from fallout is at a rate of about
0.1 r (0.02 to 0.5 r) for 30 years according to the 1956 National Acadeny
of Science eoportg4esiun-137 » which is the source of an Copreciable frac-
tion of this figure, has been show by Langham (21) not to concentrate in
the gonads above other non-musecle containing body masses so does not add
locally in a aignificant way to the gonadal dose from Cs-137 in the muscles
(0.03 r), other radionucleidss in the body and from Cs-137 and other
radionucleides and cosmic radiations in the general environment.
Sr-~90 levels in the bones of infants and young children average
0.8 ymo/gm of caleium with an observed range plus or minus of no more
than a factor of 3.
Adult bones contain much less Sr-90,
There follows
a table developed at a meeting of an ad hoo group called together by the