mbps” ede ere tate Sat” hoe quantitate the exposure necessary for such an effect short of large single doses as at Hiroshima and Nagasaki. There follows a discussion of radiation as an inducer of cancer and a conjecture that 1000r exposure to radon gas and its daughter produces induced lung cancer in the Schneeberg and Joachimsthal mines, Paradoxically, they go on to say that there is no evidence that external x- of gamma rays can cause lung tumors in nan, There is a discussion of radiation 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 concentration 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 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 proved in experiments with animals at, to be sure, radiation doses somewhat above permissible levels, The National Academy of Sciences report emphasizes this effect and cites the reduced life expectancy of American radiologists, Both reports mention effects of radiation on developing fetuses, and the temporary sterility in males exposed to a few - 18 - Enclosure III