more important. It can be estimated that the accumulated dose from thermonuclear weapons is 0.002 to 0.003 r with another 0.027 r still to come, All these doses together add up to about 0.035 r from weapons already exploded. This is a maximum dose. The loss of radio- activity from weathering has not been taken into account, nor has the protection afforded by buildings in and around which most people in this country spend a large part of their lives. It would be realistic to divide the dose by three for weathering and by seven for protection afforded as a result of time spent in houses. The average inhabitant of this country may therefore receive in the next 50 years between 0,001 and 0.002 r from this fallout, or 0.02 to 0.0 per cent of the radiation that he will receive during the same period from natural surroundings." The report has this to say about the effects of a contiming program of testing: "... if the firing of both types of bomb were to continue indefinitely at the same rate as over the past few years, there would be a build-up of activity gradually reaching a plateau in about a hundred years time which, on the same basis of calculation, would give the average individual a dose over a period of 30 years of 0.026 r or about 0.9 per cent of what he would receive in the same period from natural sources.” An important radioactive component of fallout mterial is Strontium 90, This isotope may be deposited in the bone and when present in sufficient quantities can cause bone cancer. The United Kingdom Medical Research Council report estimates that to date about 0.011 curies of Strontium 70 per square mile has fallen and that future deposits from past tests may produce a maximum of 0.045 curies of Strontium?9 per square mile by 1965, These data are immediately evaluated in the report, "... these figures should be viewed against the background of the fact that the top one foot of soil has always contained on the average about one curie per square mile of the equally, if not more, dangerous naturally occurringradium." small, They estimate the hazard from plutonium in fallout as very They feel Cesiuml37 , Iodinel31 and BariumllO are of very little significance outside a nearby area of very heavy contamination. They estimate the gonadal dose as 1% of natural background and diagnostic radiology as 22%, ‘the discussion of atomic warfare is too scant to consider here, NAS Chapter VI, Assessment of the Hazards of Exposure to Radiation, is in essence a summary of the foregoing -- pointing out the differences between effects on the individual and genetic effects. They conjecture that no "authoritative recommendation will name a figure for permissible radiation dose to the whole population additional to that received from natural sources, which is more than twice that of the general value for natural background radiation." This is estimated by the British at 0.1 r per year, hence 3r in 30 years and 7r in 70 years, The National Academy of Sciences estimate is an average of -3REPRODUCED FROM THE COLLECTIONS OF THE ARCHIVES OF THE “ENCES NATIONS d \