COPY UNIVERSITY OF CALIFORNIA RADIATION LABORATORY BERKELEY 4, CALIFORNIA OR 4 ™ RQ. November 19, 1958 MDT~4S11-58 Dr. Gordon M. Dunning, Chief Radiation Effects of Weapons Branch Division of Biology and Medicine U.S. Atomic Energy Commission Washington 25, D.C. Ref: BMREW:GMD of 11/10/58 Dear Dr. Dunning: Responding to your request of November 10, we have gathered together material covering air samples taken outdoors at a number of locations as follows: UCRL-Berkeley Oct. 15-Nov. 10, inc. "Daily", one station UCRL~Livermore " " "Daily", one station " " environs (off-site) "Weekly't, eleven stations General Electric Vallecitos Lab. 4 on-site locations California State Dept. of Public Health, Berkeley, one station " " i " " Los Angeles, one station We also submit data on rain water samples from two sites, viz; UCRL—Berkeley General Electric—Vallecitos Factors for conversion of counting information from counts per minute to microcuries per cc (or whatever) are not critically examined herein but all air sample data has been expressed in ppe/m with the exception of General Electric's counts per minute data taken daily on an integrated basis from samples remaining on stream for one week. The most extensive data and comparisons exist between our Berkeley and Livermore collections. The basic records are tabulated in extenso. We have constructed smoothed decay curves for each "daily" sample and extracted the 5, 75, 150 and 300 hour values therefrom for tabulation and graphical presentation below. We call your attention however to the fact that certain UCRL off-site "weekly" samples (of actually much less than 1 week's duration) showed considerably higher activity than any other. These are tabulated but not graphed. For your convenience we are including in the original (not in the copies) a road map and a topographical map assembly, the latter indicating locations of UCRL off-site samplers about the Livermore project.