著者

市川 米太

出版者

奈良学芸大学

雑誌

奈良学芸大学紀要. 自然科学 (ISSN:03693937)

巻号頁・発行日

vol.12, pp.51-57, 1964-02-29 (Released:2017-02-24)

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A new method for dosimetry of atomic bomb radiation in Hiroshima and Nagasaki is presented. Concerning the distribution of absorbed dose of atomic bomb radiation, only a few results already rapDrted ware insufficient to discuss the relation-ship between radiation hazard and radiation dose. Roof-tiles irradiated by the atomic bomb give off a glow, called thermoluminescence. By measuring the glow intensity, the radiation dose of the bomb can be measured. The equivalent gamma dose of bomb radiation is obtained by comparing the bomb glow curve with the Co60 gamma glow one. Glow curve from bomb radiation in the past is different in shape from that of the Co60 radiation at present. In general, the glow curve from Co60 radiation has three peaks at about 150゜C, 230゜C and 300 ゜C. But the glow curve from past radiation was found not to show any peak at about 150゜C, this is due, we interpret, to the decay at the normal temperature during the past 17years. The glow curve resulting from the bomb radiation was classified into three types, the first one is of the glow curve which does not decay at 230-C, the second is one which decays partly at 230゜C and the third is one which decays perfectly. The equivalent gamma doses which are shown in Table 1. were obtained from the sample of the first type.