Japan Atomic Energy Research Institute

About: Japan Atomic Energy Research Institute is a based out in . It is known for research contribution in the topics: Neutron & Irradiation. The organization has 7707 authors who have published 14471 publications receiving 207688 citations.

Systematics of cluster decay modes

Abstract: Spontaneous emission of some C, O, F, Ne, Mg, and Si isotopes, from heavy parent nuclei, have been experimentally observed since 1984, confirming earlier predictions. Experimental difficulties are mainly related to the low yield in the presence of a strong background of $\ensuremath{\alpha}$ particles. Until now, only some of the most favorable cases were investigated, leading to magic or almost magic proton and neutron numbers of daughter nuclei. We present a systematics of experimental results compared to calculations, clearly showing other possible candidates for future experiments. Universal curves may be used to estimate the expected half-lives.

Thorium Molten-Salt Nuclear Energy Synergetics

Abstract: In the next century, the “fission breeder” concept will not be practical to solve the global energy problems, including environmental and North-South problems. As a new measure, a simple rational Th molten salt breeding fuel cycle system, named “Thorium Molten-Salt Nuclear Energy Synergetics [THORIMS-NES]”, which composed of simple power stations and fissile producers, is proposed. This is effective to establish the essential improvement in issues of resources, safety, power-size flexibility, anti-nuclear proliferation and terrorism, radiowaste, economy, etc. securing the simple operation, maintenance, chemical processing, and rational breeding fuel cycle. As examples, 155 MWe fuel self-sustaining power station “FUJI-II”, 7 MWe pilot-plant “miniFUJI-II”, 1 GeV-300 mA proton Accelerator Molten-Salt Breeder “AMSB”, and their combined fuel cycle system are explained.

Isolation and Identification of Radiation-resistant Cocci Belonging to the Genus Deinococcus from Sewage Sludges and Animal Feeds

Abstract: Six strains of radiation-resistant gram-positive cocci were isolated from sewage sludges and animal feeds in Japan after gamma-irradiation of more than 1.0 Mrad. All six strains were able to grow on nutrient agar slants, and some strains were also able to grow on glutamate agar slants. Cells of the six strains were single or diplococci, and occasionally seen in tetrads, being spheres averaging from 0.8 to 1.0 μm in diameter. The peptide subunit of cells of all the strains contained ornithine, and the predominant fatty acid component was a C16:1. The GC content of the DNA of these strains ranged from 59 to 66 mol% thus indicating them as belonging to the genus Deinococcus Brooks and Murray 1981 which was previously called the “Micrococcus radiodurans” group. From the similar cultural characteristics and morphology, the six strains, TD1, TD3, TD9, T843, Fr 3 and Fr 7, were identified as D. proteolyticus. However, the predominant component of cellular fatty acids of strain T843 was similar to that of D. radi...

Apparently beneficial effect of low to intermediate doses of A-bomb radiation on human lifespan.

Abstract: SummaryAmong about 100 000 A-bomb survivors registered at Nagasaki University School of Medicine, 290 male subjects exposed to 50–149 cGy showed significantly lower mortality from non-cancerous diseases than age-matched unexposed males. This was deduced from the fitting of a U-shaped dose—response relationship. Reasons for this effect in males, but not in females, are discussed with reference to selection of individuals and to hormesis.