to fali-out. During the 1959 survey 76 expesed adults (and their children) and 166 unexposed persons, wha served as a comparison population, were examined. In addition, graups of children at nearby atolls were examined as controls for the growth and develepment studies on the expased Rangelap children. In 1960 anly the expased penple were examined. As a result af their exposure in 1954, many of the Rengelap peaple experienced early symptoms related to the gastrointestinal tract and skink. Later they developed a significant depression of their peripheral Blcod elements commensurate with the 175 and 69 r calculated dese af gamma radiation. Beta burns of the skin and spatty epilation alsa were found. Radicchemical analysis of urine samples showed that they had acquired a low-level beady bunden of radionuclides. Certain othsr findings possibly related ta radiation exposure included loss af weight in adults and a slight lag in grawth and development of the children. No deaths occurred that could be related to their radiation exposure, and no specific therapy was given. The S- and 4-year postexposure surveys were aimed primarily at evaluating the general medical status of the pecple in relation ta that of the unexposed comparison population. Resuits are summanized from surveys on mortality rats; birth rate; physical examinations; growth and develcpment studies; cardiavascular, cphthalmclogical, deatail, and hematcalogical surveys; measurements of the varicus parameters usually associated with aging: and possible genetic effects. Bady burdens of gamma -emitting fissican products, such as Cs/sup 137/ and zn/sup 65/, we re measured in a whele-bedy counter and checked by radiochemical analysis af urine specimens. Body bundens cof 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 cof Cs/sup 137/, 2n/sup 65/, and Sr/sup 90/ from the environme nt to man, on the rate of equilibraticn of these isetapes with the envirenment, and can the discrimination factors between feed and man. Data are included on changes in the vegetuticn of Rengelap Atall which may be due tc radicactive fallout. Tabulated data are appended. 57 references. (C.H.) Descriptears: BLOOD CESIUM 137 CONTAMINATION FALLOUT FISSION FRODUCTS FO QD GAMMA RADIATION GAMMA SOURCES INTESTINE MAN MEDICINE FOPULATIGNS QUALITA TIVE ANALYSIS RADIATION DETECTORS RADIATION EFFECTS SKIN STOMACH STRONTIUM 90 URINE ZINC 65: BETA FARTICLES BLOOD BLGOD VESSELS EYES FALLOUT GENETICS HEART LIFETIME MAN MEDICINE FOPULATIONS QUALITATIVE ANALYSIS RADIATION INJURIES RADIOISOTOPES THERAFY URINE; ENVIRONMENT FALLOUT PLANTS RADIATION EFFECTS Subject Codes (NSA): RIOLOGY AND MEDICINE Record - 38 sod es 500! CIT 145871 NSA-15-002914 FURTHER CONTRIBUTIONS ON GROSS BETA RADIOACTIVITY OF RIOLOGICAL AND RELATED SAMPLES AT THE ENIWETOK PROVING GROUND, 1952-1958. SECTION I. PHYSICAL DECAY OF SAMPLES FROM ENIWETOK ATOLL IN 1952.SECTION II]. FURTHER CONTRIBUTIONS ON GROSS BETA RADIOACTIVITY OF PLANKTON AND BOTTOM SAMPLES AT RONGELAP ATOLL, 1954-1958. SECTION III. FURTHER CONTRIBUTIONS ON GROSS BETA RADIOACTIVITY OF FI Bonham, kK. Washington. Univ., Seattle. Lab. of Radiation Biclagy Publication Date: Dec. 4, 1959 47 p. Primary Report No.: UWFL-63 Journal Announcement: NSALS