some radioactive materials internally by ingestion and inhalation. Estimates of the internal body burden from fall-out were obtained from the analysis of urine samples collected soon after exposure. These data indicated that the acute hazard from internally deposited fission fragments was quite small as compared to the whole body gamma radiation exposure. Although the radioactivity levels in the urine were low, the actiyity was sufficient to obtain reasonable precision and to warrant additional long term studies of the activity levels and excretion patterns of this rather large and well isolated population. The people from Alinginae and Utirik were returned to their home islands in June 1954. Radiation intensities on Rongelap, however, precluded an early return to this atoll and the Rongelap people lived on Majuro from June 1954 until July 1957. Basic data on the food crops of the Marshallese indicated that after resettlement on the contaminated atolls the intake of Sr/sup 90/ would be increased n/sup 65/, and Co/sup 60/ were dietary considerably, and that Cs/sup 137/, Zn/sup 65/ , and Co/sup 60/ were dietary constituents of island and ocean foodstuffs, and also would be assimilated. The expected increase in the trace amounts of radionucleides in the food supply of a large population would afford an opportunity to investigate the rate of equilibration and the discrimination factors operating between food supply and man. Urinary excretion levels of Cs/sup 137/ and Sr/sup 90/ were measured from March 1954 through March 1958. Zn/sup 65/ levels were first measured in 1958 samples. tabulated. (C.H.) Data are Descriptors: BODY; CESIUM 137; COBALT 60; CONFERENCE; DECONTAMINATION; FALLOUT; FISSION PRODUCTS; FOOD; GAMMA RADIATION; ISLANDS; MAN; MARSHALL ISLANDS; METABOLISM; NUCLEAR EXPLOSIONS; PACIFIC OCEAN; POPULATIONS; QUANTITATIVE ANALYSIS; RADIATION DOSES; RADIOACTIVITY; SAMPLING; STRONTIUM 90; TESTING; URINE; USA; ZINC 65 Subject Codes (NSA): BIOLOGY AND MEDICINE 10/5/204 (Item 204 from file: 109) 122971 NSA-14-006504 ATMOSPHERIC CONDUCTIVITY. Annex 4.6 of Scientific Director’s Report of Atomic Weapon Tests at Eniwetok, 1951. OPERATION GREENHOUSE Coroniti, S.C.; Walt, G.R.; Parziale, A.J. Air Force Cambridge Research Center, Mass. Publication Date: Sept. Primary Report No.: 1951 83 p. WT-71(Del.) Journal Announcement: NSA14 Availability: NTIS Document Type: Report Language: English Data are presented from measurements of air conductivity and ion content of air within an atomic cloud, and measurements of air conductivity above the shot area and adjacent terrarn. The rate and magnitude of fall-out and its relation to the direction and velocity of the wind were also measured. (C.H.) Descriptors: AIR; ATMOSPHERE; DISTRIBUTION; ELECTRIC CONDUCTIVITY; ENVIRONMENT; FALLOUT; IONS; MEASURED VALUES; NUCLEAR EXPLOSIONS; RATIO; VELOCITY; WIND Subject Codes (NSA): GEOLOGY, MINERALOGY, AND METEOROLOGY 10/5/205 122577 (Item 205 from file: NSA-14-006108 PHYSICAL FACTORS AND DOSIMETRY Sondhaus, C.A.; Bond, V.P. 109) IN THE MARSHALL ISLAND RADIATION EXPOSURES Naval Radiological Defense Lab., San Francisco Publication Date: Dec. 1955 26 p. Primary Report No.: WT-939(Del.) Note: Decl. with deletions Sept. 15, 4.1 of QUANTITY OPERATION CASTLE 1959. Addendum Report for Project Journal Announcement: NSA14 Availability: NTIS Document Type: Report 50035496 Language: English The physical factors and dosimetry of the fall-out on the Marshall