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quantitate the exposure necessary for such an effect short of
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There follows a discussion of radiation as an inducer of
_
cancer and a conjecture that 1000r exposure to radon gas end
its daughter produces induced Lung eancer in the Schneeberg and
Joachimsthal mines,
Paradoxically, they go on to say that there
is no evidence that external x- or gamma rays can cause lung
tumors in
nan,
;
of
co
_
There is a discussion of rediation as the cause of bone
tumors drawn principally from the reports of cancer of bones in
radium dial workers and individuals given radium therapeutically,
Most of this is American data,
They feel there is not much of a
factor of safety in the present maximum permissible concentra-
tion for radium,
They indicate the risk of development of bone
cancer from x-ray or gamma exposure in industry is insignificant,
there is brief mention of skin cancer as induced by radiation,
and thyroid gland cancer,
Again the likelihood of this sort of
thing from industrial exposure under modern controlled conditions
—e
is insignificant except, of course, in the event of accidental
overexposure,
.
Radiation cataracts are mentioned as a hazard subject to
ready control,
.
This report seems to understate effects of radiation on
life span which has been so clearly preved in experiments with
animals at, to be sure, radiation dosee someuchat above permissible
levels, The National Academy of Sciences report empnesizes this
effect and cites the reduced life expe: ancy of American viclclogists,
Both reports mention effects ef r dieticn on developins
fetuses, and the temporary sterility in males exposed to = fey
~ 18 -
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