RADIATION EXPOSURES TO THE PUBLIC The data and their evaluation concerning strontiun-90 produced by nuclear weapons testing will be discussed by others at this:- hearing. os 4a The external gamma exposures through September 1955 may be described briefly as follows: , : "~—-With respect to the gamma dose, the average value for the United States is higher than it is for the rest of the world. The range of values in the United States is relatively narrow, 6 to 49 millirads, except for Salt Lake City (160), Grand Junction (120), and Albuquerque, N. M. (110). The representative dose for eastern United States is about 15 to 20 millirads, with slightly higher values in the Middle West and lower values on the West Coast. The cumulative gamma dose at the foreign stations is in the _range of 4 to 23 millirads, except for some of the Pacific islands, where the range is from 13 to 150 millirads.——"29 These are ‘tinfinity" doses, i.e., the maximum possible exposures one might rsaceive if he were out-of-doors for the lifetime of the radioactivity, there were no weathering effects, and the activity decayed according to (time)-1-2, The actual radiation ex- posures Will vary with changes in these conditions, but roughly may approximate one-half of the infinity dose. In summarizing, the data on radiation exposures from fallout, the National Academy of Sciences - National Research Council Report said: ee -~ 30 - Ls