Bulletin of the National Hygienic Laboratory, Tokyo, 31, 205-7 (1956). No artificial radiation was found in any of 32 samples of milk of cows fed on the weeds which were supposed to have been contaminated with fission products in the rain. The researchers who reported finding artificial radiation in the milk in Japan appear to have mistaken natural K*° radiation for artificial radiation. o1. Nagasawa, Kakuma, Kawashiro, Iwao, Enomoto, Masayoshi, Kashima, Tetsu, and Matsushima, Takashi. STUDIES ON RADIOCONTAMINATION OF FOODSTUFFS EFFECTED BY A- OR H-EB° MB EXPLOSION. IV. RADIOCONTAMINATION OF DRINKING WATER, VEGETABLES ANL .RUITS IN JAPAN CAUSED BY H-BOMB EXPLOSIONS AT BIKINI ATOLL, 1954. Bulletin of the National Hygienic Laboratory, Tokyo,31, No. 6, 209-12 (1956). The vegetables collected from various parts of Japan from May 19th to 30th, 1954 were considerably contaminated with radioactivity, though they were almost free from radiation after being washed. The dried and ash samples of some vegetables collected from August 30 to September 7, 1954 showed almost no artificial radiation. The radiation in rain water, tank water and well water collected from various parts of Japan from May to August 1954 were examined. 52. Nagasawa, Kakuma. STUDIES OF RADIOCONTAMINATION OF FOODSTUFFS AFFECTED BY A- OR H-BOMB EXPLOSIONS. V. RADIOCONTAMINATION OF SEA FISH AND ITS RADIOCHEMICAL ANALYSIS. No. 6, 213-229 (1956). Bulletin of the National Hygienic Laboratory, Tokyo 31, 53. Nagasawa, Kakuma, Nakayama, Goichi, Serizawa, Jun, and Nishizaki, Sasao. STUDIES ON RADIOCONTAMINATION OF FOODSTUFFS AFFECTED BY A- OR H-BOMB EXPLOSION. VI. ON THE EFFECT UPON LIVER OIL PRODUCTION BY THE USE OF RADIOCONTAMINATED FISH LIVERS AS A STARTING MATERIAL. Bulletin of the National Hygienic Laboratory, Tokyo 31, No. 6, 209-12 (1956). The authors measured the radiation in each fraction in the processof liver oil production by the use of radiocontaminated liver as a starting material. In the result, almost no radioactivity was found in the liver oil; most of it was found in the residue and the waste. Therefore, it was easy to prepare liver oil from the liver with radiocontamination from Aor H-Bomb explosion experiments, 1954. Das 34, Nakano, Shoichi. STUDIES OF THE ANALYTICAL CHEMISTRY ON FILTER PAPER. XVI. PAPER CHROMATOGRAPHY OF RADIOACTIVE SUBSTANCE. RADIOCHEMICAL STUDIES ON “BIKINI ASHES.” Bulletin of the Chemical Society of Japan 29, 219-24 (1956). Radioactivity from “Bikini ashes” and U* fission is divided into 3 major groups by ion- exchange methods and then subdivided by paper chromatography. In the first group, TeO;’, so7?, PO;3, and 17, as well as two Rul spots are resolved in filter paper by iso-AmOH, Cs8" and Ce! from the second and Y"" and Sr® from the third group are separated also. It is shown that the presence of carrier or foreign elements alters the chromatographic behavior of the tracers. 95. Natanson, G. L. RADIOACTIVE AEROSOLS. Uspekhi Khimii 25, 1429-45 (1956) (in Russian). Tabulations are given presenting various published data on safe atmospheric concentrations of various radioactive and nonradioactive aerosols. Methods of determination of active aerosol concentrations and dispersion as well as the technical applications of “labeled” aerosols are discussed. The effect of atomic explosions are analyzed consider- ing the “nominal” atomic bomb based on U?"5 and Pu?* equivalent to 20,000 tons of TNT. 36. Pace, F.C. EFFECTS OF ATOMIC BOMB RADIATIONS ON HUMAN FOOD. Canadian Journal of Public Health 47, 113-141 (1956). The increase in energy release of atomic weapons has increased the hazard of atomic radiation to food. Products of atomic explosions are probably similar regardless of size. Of the energy released, blast energy accounts for one-half, heat flash for one-third, initial nuclear radiation for one-twentieth, and residual radiation (potential fallout) about one- tenth. Radioactive elements may enter man by inhalation, by open wounds, or by ingestion 163 x}