233 We are very much impressed by the fact that this may be the lact decade maybe only the last few years in history when it will be poseible to really get some good data on natural radiation, The natural beckground has not been really disturbed yet, It still reads the way it always hae in my estimates, but it is changing fast. In ten years from now it may be too late to ever know what people were exposed to back in the aboriginal days of 1945 and 1950. . I think also that with the inatrue ment, with components that iiave become avail= able within the last year or so, it is quite feasible to make these low level measurements over large areas, relatively inexpensively. We are going to take worldwide, we hope, documentation of beckground both as respects gamma radiation and the preponderance of natural isotopes and Leonard Solon is going to undertake the gamma background study and John Harley and his staff, the isotope abundande study, We think that this 4s something -- well, what we are going to do is try to have

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