Abstract: Obtaining detailed photographs of the early stages of the first hydrogen bomb explosion in 1952 posed a number of problems. First, it was necessary to invent a continuous-access camera which could solve the problem that existing million-picture-per-second cameras were blind most of the time. The solution here was to alter an existing camera design so that two modified cameras could be mounted around ai single high-speed rotating mirror. A second problem, acquiring the necessary lenses of precisely specified focal lengths, was solved by obtaining a large number of production lenses from war surplus salvage..A third hurdle to be overcome was to test the new camera at an A-bomb explosion. Finally, it was necessary to solve the almost impossible difficulty of building a safe camera shelter close to a megaton explosion. This paper describes the way these problems were solved. Unfortunately the successful pictures that were taken are sill classified. Major Descriptors: *EXPLOSIONS Descriptors: CAMERAS; PROTECTION ENIWETOK; -- ULTRAHIGH-SPEED PHOTOGRAPHY HYDROGEN; MHZ RANGE 01-100; RADIATION Broader Terms: ELEMENTS; FREQUENCY RANGE; ISLANDS; MARSHALL ISLANDS; RANGE; MICRONESIA; NONMETALS; OCEANIA; PHOTOGRAPHY Subject Categories: 450200* -- Military Technology, Defense -- Nuclear Explosions & Explosives 440600 -- Optical Instrumentation -- Weaponry, R. & National (19390-) 10/5/323 (Item 23 from file: 103) 03373947 JPN-92-007370; EDB-92-136704 Title: Radiation in living environment Author(s): Ichikawa, (Japan) ) MHZ (Nuclear Safety Research Association, Tokyo Title: Proceedings of the third international symposium on advanced nuclear energy research Corporate Source: Japan Atomic Energy Research Inst., Tokyo (Japan) (Code: 3413000) Conference Title: 3. international symposium on advanced nuclear energy research: global, environment and nuclear energy Conference Location: Mito (Japan) Publication Date: 1991 p 12-21 Conference Date: (462 p) 13-15 Mar 1991 Report Number(s): INIS-JP-005 CONF -910359-Order Number: DE92514989 Document Type: Miscellaneous Analytic; Conference Literature Language: In English Journal Announcement: EDB9218 Availability: OSTI; Subfile: ERA Exchange) . NTIS; INIS (Energy Research Abstracts); JPN (Japan (sent to DOE from) ) ETD (Energy Technology Data Country of Origin: Japan Country of Publication: Japan Abstract: Aside from the atomic bomb attacks in 1945, the experience of radioactive contamination of human environment was the exposure of a tuna fishing boat to the radioactive fallout of a hydrogen bomb test explosion at Bikini atoll in March, 1954. Thereafter, radioactivity was frequently detected in fishes in central Pacific Ocean. Radioactivity was also detected in rain, which resulted in the contamination of agricultural products. Due to the great concern of general public for the radioactivity in food materials, the government initiated the national program of radioactivity surveillance. Since then, the fallout 3b 10 US DOE Project/NonDOE Project: NP = radioactivity due to nuclear test explosions was the main object surveillance in 1950s and 1960s, but the program was gradually expanded, ur to include natural radiation, the artificial radioactivity due to the peaceful uses of nuclear energy and other special programs. The history of the radioactive contamination of environment, natural radiation, medical exposure, the radioactive fallout due to nuclear tests, nuclear power generation and the Chernobyl accident are reported. Major Descriptors: *RADIOACTIVITY -- GLOBAL ASPECTS Descriptors: ANNUAL VARIATIONS; BODY BURDEN; CESIUM 137; (K.I.). CHERNOBYLSK-4