symptoms related to the gastrointestinal tract and skink. Later they developed a significant depression of their peripheral blood elements radiation. gamma commensurate with the 175 and 69 r calculated dose of l Radiochemica found. were also epilation Beta burns of the skin and spotty analysis of urine samples showed that they had acquired a low-level body bunden of radionuclides. Certain othsr findings possibly related to radiation exposure included loss of weight in adults and a slight’ lag in growth and development of the children. No deaths occurred that could be related to their radiation exposure, and no specific therapy was given. The 5- and 6-year postexposure surveys were aimed primarily at evaluating the general medical status of the people in relation to that of the unexposed comparison population. Resuits are summanized from surveys on mortality rats; birth rate; physical examinations; growth and development studies; cardiovascular, ophthalmological, deatail, and hematological surveys; measurements of the various parameters usually associated with aging; possible genetic effects. Body burdens of gamma -emitting fission products, such as Cs/sup 137/ and Zn/sup 65/, we re measured in a and whole-body counter and checked by radiochemical analysis of urine specimens. Body bundens of Sr/sup 90/ were estimated from urinary excretion as determined by radiochemical analyses. This study of the internal contamination of the Marshallese provided information on the movement of Cs/sup 137/, Zn/sup 65/, and Sr/sup 90/ from the environme nt to man, on the rate of equilibration of these isotopes with the environment, and on the discrimination factors between food and man. Data are included on changes in the vegetuticn of Rongelap Atoll which may be due to radioactive fallout. Tabulated data are appended. 57 references. (C.H.) Descriptors: BLOOD CESIUM 137 CONTAMINATION FALLOUT FISSION PRODUCTS FOOD GAMMA RADIATION GAMMA SOURCES INTESTINE MAN MEDICINE POPULATIONS QUALITATIVE ANALYSIS RADIATION DETECTORS RADIATION EFFECTS SKIN STOMACH STRONTIUM 90 URINE ZINC 65; BETA PARTICLES BLOOD BLOOD VESSELS EYES FALLOUT GENETICS HEART LIFETIME MAN MEDICINE POPULATIONS QUALITATIVE ANALYSIS RADIATION INJURIES RADIOISOTOPES THERAPY URINE; ENVIRONMENT FALLOUT PLANTS RADIATION EFFECTS Subject Codes (NSA): BIOLOGY AND MEDICINE 10/5/178 155643 (Item 178 from file: NSA-15-012705 109) RADIOBIOLOGICAL STUDIES AT THE ENIWETOK TEST THE WESTERN PACIFIC Donaldson, L.R. Washington. Univ., Seattle. Lab. Publication Date: Apr. 15, 1959 Primary Report No.: TID-5967 Journal Announcement: NSA15 Document Type: Report Language: English SITE AND ADJACENT AREAS OF of Radiation Biology _ 19 p. Studies with the radioactive materials resulting from the weapons testh and deposited in the sea and on the islands at Bixiri and Eniwetok Atolls in the Marshall Islands have made it possible to follow the biological cycling of these materials even where they have become diluted to 90039864 infinitesimal quamtities. Extensive investigations have answered many questions relating to the economy of the sea, have opened up new knowledge of the life zonss of coral atolls, and have reshaped in important ways some of the basic concepts of biological science. The physical and geographic characteristics of the region are described, and the ecology is discussed. A penfect economy of use of substances essential to life has been demonstrated in this region. Little or no time is lost between steps in the biological cycling of materials, for there is not only an abundance of organisms but also a wide variety of species. Availabls substances are rapidly taken up by the bioth. Plankton and some of the algae, which are the key organisms in the food chain, may concentrate within themselves more than a thousand times the amount of radioactive substances found in the sea water. The passage of fission products through the plants and animals of the region is traced. By following the pattern of gross radioactivity, it has been possible to delineate the broad trends in the distribution of radioactive material in an atoll and its surrounding area. Experience in