Nevada Test Site. However, the difference in Cesium values between residents of Salt Lake City and points outside Utah was significant to a level of 1%. This trend for persons in the Intermountain West to have slightly higher Cesium values than persons in the rest of the United States has been recently confirmed by Anderson'?) who found an average value of 51 ywuc C5137 gram K for 35 persons from Utah, Colorado, and Wyoming, which is lightly larger than his average value of 44 uuc cs 9? /gram K, over the United States. corresponding to 207 persons from all All these values are close to the average value of 51 uuc Cs 137 pgp am K for residents in the United States measured in Argonne National Lab by Milter (8), 1958 at the In summary, we have found the levels of fallout Cesium 137 in persons who live near the Nevada Test Site to be similar to the levels in persons in Salt Lake City. While the average level seems slightly higher for Utah than the rest of the United States this level is not alarming, being only about 1/1000 of the maximum permissible cs }3? concentration for the general population. We are very appreciative of the generous assistance of Drs. B.C. Anderson and M.A. Van Dilla of the Los Alamos Scientific Laboratory and Drs. C.E. Miller and R.B. Rowland of the Argonne National Laboratory in checking the results (2) of our human measurements. D.W. Glad, 0.H. Taysum, G.C. Westenskow, L. Jackson, L.W. Blake, and W.M. Hammer of our laboratory contributed significantly to the success of these measurements. - -16-

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