rag phd. BIOLOGY AND MEDICINE through June 26. It will not be possible to give these data their final interpretation in terms of strontium 80 concentrations in the stratosphere until the question of the efficiency of air filters can be resolved, Forelgn Food Collection Food samples werecollected in Spain by a nutrition team of the Interdepartmental Committee on Nutrition for National Defense and will be analyzed for their strontium 90 and calcium content. (End of UNCLASSIFIED section.) RADIOBIOLOGICAL SURVEYS IN THE PACIFIC (Gee A number of radioblological surveys were under way in the Pacific to monitor the radio- activity in the water and marine organisms resulting from the current test series, Operation HARDTACK, In addition, ecological studies at Rongelap Atoll will continue. Each of these programs is described briefly below. . Surveys in Connection with HARDTACK Informal arrangements were made with a radiochemist of the National Institute of Health, Tokyo, for the collection of tuna samples at a port of landing in Japan. A total of 2,600 samples will be collected at the rate of 20 samples per day 5 days a week for 6 months and sent to the Laboratory of Radiation Biology of the University of Washington. All samples will be counted for total beta and gammaactivity, and a Hmited number will be selected for radiochemical analysis. The Japanese will retain dupljcate samples, and it is expected that information on sa-nple analyses will be exchanged with them. ; In connection with the WAHOO underwater detonation on May 15, which was only the third underwater Cetonationsince the beginning of testing in the Pacific, the University of Washing- ton and the Office of Naval Research joined forces to observe the physical and biological dispersal in the water of radioactivity from that event. The Hydrographic Office Vessel USS Rehoboth was used for the observation of water structure and the collection of water, plankton, and fish, both before and after the event. A limited number of biological samples were collected at Eniwetok, Bikini, and a few nearby atolls prior to Operation HARDTACKand will also be collected following the test series. Personnel were to be available during the operation for other radiobiological surveys that might be needed. Immedciziély following the conclusion of the current test series a survey Similar to the post-REDUING survey of 1956 will be conducted to measure the contamination of water in the restricted area preparatory to removing the boundaries of the area. The survey will go beyond the reszricted area and in general, will include the area between Bikini, Eniwetok, and Guam. Water, plankton, and fish will be collected. Gross beta and gamma counts will be made of all samples and radiochemical analyses of a limited number of selected samples. Beginnixg in July, four radiobiological surveys were to be made during the year at Guam, in the Palau Islands, and in the Gulf of Siam by the Vanderbilt Foundation of Stanford University. The ocean transport of contamination from the test site to these areas requires several months. Those orgasisms will be collected that are most likely to concentrate radioisotopes from Weapors tests (commonly called indicator species) and that correspond most closely to species sampled in cther radiobiological surveys. Indicator species include fish, giant clams, lobster, plankton, ara land crabs. The samples will be sent to the University of Washington for counting and radiochemical analysis, DOE ARCHIVES