FIELD OPERATIONS PHASE B The second phase of the operation covers the collection of ground level fall out throughout the area of continental United States. a. eTaden! ‘ Fifty loca- tions have been selected covering a random distribution of points designed to provide adequate coverage of the whole country. Through the cooperation of the U.S. Weather Bureau, these collection points have been located at Weather Bureau stations where the personnel have agreed to participate by collecting specifically defined data. Collec-= tion procedures are given in Appendix B. In order that no single laboratory would be overloaded during the test period and to facilitate prompt evaluation and correlation of data, AEC and contractor laboratories have agreed to participate in the analytical work. The country was subdivided into sections and all collection stations within those sections will submit their samples to the designated laboratory. The laboratories are Argonne National Lab, Oak Ridge National Lab, Hanford Works, University of Rochester AEC Project and NYO Analytical Lab. All counting and recording will be on a uniform basis. Counting and recording procedures are given in Appendix Co. Instructions covering the agreed procedure have been cir= culated to all analytical labs. Also in the interest of uniformity, identical counter tubes have been supplied to each of the stations by the NewYork office. Appendix D shows the distribution of stations and the responsible analytical laboratories. A code letter beside each station indicates the type of sample which will be collected. A deviation from random distribution was dictated by the following considerations: 1) lecation of large cities,for population density, 2) location of photographic industry and 3) concentration on 85th meridian to tie in with Phase A. Each of the fifty stations has been send a kit of equipment according to the schedules listed in Appendix E. Each of the laboratories will submit a weekly tabulation of results to the Data Coordinator at the New York office for central correlation. Extreme findings in those areas of interest to the photographic industry are to be phoned in immediately on determination, abe 7] DUN AtcrIvED 5