a 7 Sa } weapons, For these latter the dose from the radioactivity sti11 to be deposited is more important, It can be estimated that the accumulated dose from thermonuclear weapons is 0,002 to 0,003r with another 0.027r still to come, All these doses together add up to about 0,035r from weapons already explosed. maximum dose, This is a The loss of radioactivity 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 0,04 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 continuing . 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 buildup 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,.026r or about 0.9 per cent of what he would receive in the same period from natural sources," An important radioactive component of fallout material 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-90 per square mile has fallen and that future deposits from past tests may produce a maximum of 0,045 curies of Strontium-90 per square mile by 1965. - 20 - These Enelosure III