c/kg wet weight. The levels of radioactivity in bone and muscle tissues of fish collected during 1957 were about the same as the levels for similar tissues collected in 1955. Gamma spectra analysis and ion-exchange methods revealed the presence of Zn/sup 65/, Co/sup 57/, Co/sup 58/, Co/sup 60/, Mn/sup 54, and Fe/sup 55/. Radiostrontium was found only in small amounts (about 0.0014 mu c/kg wet weight) in the bone of fish from Kabekle Island, Rongelap Atoll. Approximately 40 per cent of the total radioactivity in the reef fishes was due to Zn/sup 65/, 28 per cent to cobalt, 26 per cent to Fe/sup 55/, and 6 per cent to other radionuclides. (auth) ; Descriptors: BETA PARTICLES; BONES; COBALT 57; COBALT 58; COBALT 60; CONTAMINATION; FISH; GAMMA RADIATION; ION EXCHANGE; IRON 55; MANGANESE 54; MUSCLES; QUANTITY RATIO; RADIOACTIVITY; SPECTROMETERS; STRONTIUM 90; TISSUES; ZINC 65 Subject Codes (NSA): HEALTH AND SAFETY 10/5/224 096247 (Item 224 from file: NSA-13-002880 RADIONUCLIDES Lowman, F.G. 109) IN PLANKTON NEAR THE MARSHALL ISLANDS, 1956 Washington. Univ., Seattle. Applied Fisheries Lab. Publication Date: Feb. 14, 1958 34 p. Primary Report No.: UWFL-54 Journal Announcement: NSA13 Availability: NTIS Document Type: Report Language: English Contract No.: AT(45-1) 540 Radiochemical separations were made on plankton samples collected in and west of the Eniwetok Proving Ground in September 1956. Ion exchange resin column and precipitation techniques were used. Fission products, mainly Zr/sup 95/-Nb/sup 95/ and Ce/sup 144/Pr/sup 144/, contributed an average of 29% of the total radioactivity. The remaining 71% of the activity was contributed by the non-fission radioisotopes Zn/sup 65, Co /sup 57,58,60,/ and’ Mn/sup 54/. Radio active zinc, cobalt, and iron acconted for averages of 24, 26, and 21%, respectively, of the total radioactivity. Mn/sup 54/ was present in trace amounts. Variations in ratio of occurrence for the different non-fission products with change in geographical location was observed. Relatively high levels of Zn/sup 65/ were centered in the area near Bikini and Eniwetok Atolls. The area of high levels of radioactive cobalt and iron in comparison to Zn/sup 65/ was located approximately 480 Miles west and slightly north of Eniwetok Atoll. (auth) Descriptors: CERIUM 144; COBALT 57; COBALT 58; COBALT 60; FISSION PRODUCTS; ION EXCHANGE; IRON 55; MANGANESE 54; MARSHALL ISLANDS; MICROORGANISMS; NIOBIUM 95; PLANKTON; PRASEODYMIUM 144; PRECIPITATION; RADIOACTIVITY; RADIOCHEMISTRY; TRACE AMOUNTS; ZIRCONIUM 95 Subject Codes (NSA): HEALTH AND SAFETY 10/5/225 095478 (Item 225 from file: 109) NSA-13-002109 OBSERVATIONS OF RADIOACTIVE CLOUDS FROM ATOMIC TESTS ATMOSPHERIC TRANSPORT AND EXCHANGE PROBLEMS ~ IN RELATION TO (Beobachtungen an Radioaktiven Schwaden von Atomtechnischen Versuchen im Sittkus, A. Publication Date: nd 13 p. Primary Report No.: TI-776 Note: Translated by D.A. Sinclair (National Research Council of Canada) from Beitr. Physik Atmosphare 30, 200-206(1958) Journal Announcement: NSA13 Document Type: Journal Translation Language: English Regular measurements have been made since 1963, at Freiburg, West Germany, of the long-lived radioactive materials contained in rain water. 9003605 Hinblick auf Atmospharische Transport- und Austauschprobleme) In 1953 when a series of atomic bomb tests took place in the Nevada desert, U.S.A., a travelling time of 10 to 20 days was determined for the resulting atomic cloud. The shortest time for arrival of an atomic cloud