0018933 to summarize and evaluate work done on fallout partition up to that time (Reference 26), The conferees concluded that the best generalization which could be reached on the basis of the data presented was an equal distribution of radioactivity between world wide and local fallout for both land and water detonations in the megaton range. 1.206 World-wide Fallout. World-wide fallout has been of great concern to persons responsible for the conduct of weapons tests on account of the possible consequences attendant upon the global dispersal of radioactive substances, The dangers from external irradiation are generally believed to be of a minor nature, due to the low levels of activity involved, but the incorporation of nuclides into the human system through the usual biological channels introduces the possibility of long-term effects whose seriousness is not easily determined. The local fallout from the tests at Eniwetok, as defined earlier, will settle out in the Pacific Ocean and hence will be of only indirect concern, However, the tropospheric and stratospheric fallout will come down over land areas. Careful consideration of the nuclides present in global fallout has indicated that sr?° is the one to be most feared due to its possible accumulation in the human skeleton and subsequent long-term irradiation of the hematopoetic tissues (Reference 24), Consequently, a major part of the work done on world-wide fallout has been directed toward the esti- GAN BRUNO FRC