AT(45-1)-540 Contract No.: The pattern of changing levels of radioactivity is given for the tissues of land hermit crabs, Coenobita perlatus, from Belle lsland, Eniwetok . nearly two years following the 1954 Atoll, during a period of series of atomic tests. Sr/sup 90/ + Y/sup 90/, principal long-lived fission products foumd. and Cs/sup 137/ were the Sr/sup 90/ levels in the skeleton remained constant throughout the period of study. (auth)! ANIMALS; BONES; CESIUM 137; CRABS; FALLOUT; FISH; FISSION Descriptors: PRODUCTS; LIFETIME; NUCLEAR EXPLOSIONS; RADIOACTIVITY; STRONTIUM 90; TISSUES; YTTRIUM 90 ‘ Subject Codes (NSA): BIOLOGY AND MEDICINE 10/5/238 (Item 238 from file: 080122 NSA-12-004673 109) HUMAN AND CATTLE THYROID RADIOACTIVITY ASSOCIATED WITH FALLOUT: 1955 TO OCTOBER 1956 OCTOBER White, M.R. California. Univ., Berkeley. Radiation Lab. Publication Date: Mar. 1, 1957 15 p. Primary Report No.: UCRL-3703 Journal Announcement: NSA12 Availability: NTIS Document Type: Report Language: English Contract No.: W-7405-ENG-48 Thyroids from humans, obtained at autopsy, were followed for radioactivity from January 1956 to October 1956. There is less than one chance in one thousand that human thyroid tissue could have been irradiated to the extent of 0.001 rep from I/sup 131/ fallout. The probable value is no more that 0.00016 rep during this period. Thyroids from cattle Slaughtered in the San Francisco Bay Area were followed for radioactivity from October 1955 to October 1956. Two periods of increase in radioactivity, possibly due to smallyield detonations in Nevada, were seen in December 1955 and January 1956. A period of high activity in cattle thyroid, probably due to a Russian detonation, began in March, and radioactivity from this delivered a maximum of 0.2 rep. Another period of high activity, presumably due to the Bikini tests, began in May 1956 and was continuing at the time this report ended. It delivered (up to October thyroid tissue. This level of radiation exposure would produce no change in physiological function of the thyroid and would not be detrimental to 10/5/239 079483 (Item 239 from file: NSA-12-004034 109) RADIOACTIVITY IN THE REEF FISHES OF BELLE 1954 TO NOVEMBER 1955 Welander, A.D. Washington. Univ., Seattle. Publication Date: May 17, 1957 Primary Report No.: UWFL-49 Journal Announcement: NSA12 Availability: NTIS Document Type: Report Language: English Contract No.: AT(45-1)-540 MAN; NUCLEAR TESTING; THYROID; ~ ISLAND ENIWETOK ATOLL APRIL Applied Fisheries Lab. 42 p. Studies of the radioactivity ln reef fishes of Belle (Bogombogo) Island, Eniwetok Atoll, were made during a period of about one year followlng the atomic detonations in 1954. 9003b3b cattle. (auth) Descriptors: CALIFORNIA; CATTLE; FALLOUT; IODINE 131; EXPLOSIONS; PHYSIOLOGY; RADIOACTIVITY; SAN FRANCISCO BAY; TISSUES Subject Codes (NSA): BIOLOGY AND MEDICINE Thirty-four different collections were made amd 693 specimens were analyzed to determine the trend or decline of radioactivity. The decline of radioactivity during the period under study was generally similar in all species. The relative amount of radioactivity per gram of tissue was greatest in the alimentary tract, with the liver,