inthe present maximum permiss ble 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 doeses 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 exposad to a few hundred roentgens at a single exposure. The British report is totally reassuring on the effects of occupational exposures on fertility. Chapter IV is a very lengthy genetics effects discussion with many figures, tables and calculations and a critique of the Atomic Bomb Casualty Commission genetics study in Japan, This is a highly technical discussion and comes out with the same conclusions as does the National Academy of Sciences, namely that a dose of | radiation which would double the mtation rate of a relatively small group of prospective parents would produce no noticeable ‘effects. "For levels of radiation up to the doubling dose, and even some way beyond, the genetics effects of radiation are only appreciable when reckoned over the population as a whole and med cause na alarm to’ the individual on his own account," Chapter V discusses natural radioactivity -~- radiation from appurtenances of civilization and occupational exposure to radtation. The report concludes that diagnostic medical x-rays produce exposures to the germ cells of the order of 22% that of background and constitute the most important source of man-made irradiation, It is estinated that the United Kingdom. Atomic Energy Authority 's employees receive an average does of O.lir per year. NAS The estimated ‘external radiation exposure to people jn Great Britain from fallout from all past nuclear tests has been quite Minimal. "... Including all ordinary atomic bombs exploded before December 1955, and calculating all of the radioactivity which they have contributed and-will contribute ever the next 50 years, it is found that the total dose which a man, continuously out of doors, day and night, would receive is 0,005 r. To this dose from ordinary atomic bombs must be added the does of thermonuclear weapons. For these latter the dose from the radioactivity still toa be deposited is - 2 < REPO MLE FPGM THE COLL ECTIONS COTS ARCHIVES OF THE NATIONAL ACADEMY QF SCIE NCES