著者

岩倉 哲男

出版者

Japan Health Physics Society

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.10, no.3, pp.131-140, 1975 (Released:2010-02-25)

参考文献数

28

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An attempt is made to review behavior of tritium released into the environment in order to give preliminary knowledges for monitoring present and future levels of tritium in the environment. A systematic distribution of bomb-produced tritium on a global scale has been recognized from an evaluation of the precipitation data conducted by the IAEA-WMO Precipitation Network Survey. Latitudinal dependence and continental effect of the tritium concentration in precipitation were found pronouncedly. The mean residence times of several compartments of hydrological cycle for tritiumm are discussed topically. Recent tritium concentration in environmental water in Japan are summarized. Organically bound tritium in sediments, aquatic plants, fish, and foodstaffs sometimes showed higher concentration than tritium in ambient water. This is probably explained as memory effect or inheritance effect through eco-systems due to long residence time of organically bound tritium. Instrumentation, detection limit and dose calculation for tritium monitoring are proposed. Tritium surveillance activities conducted by U. S. Government are reviewed also historically with some representative data.

著者

井上 義和 岩倉 哲男

出版者

Journal of Radiation Research Editorial Committee

雑誌

Journal of Radiation Research (ISSN:04493060)

巻号頁・発行日

vol.31, no.4, pp.311-323, 1990-12-15 (Released:2006-06-16)

参考文献数

15

被引用文献数

15

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Polished rice samples harvested in 1985 were collected from 25 prefectures throughout Japan. Concentrations of both tissue free water tritium (TFWT) and organically bound tritium (OBT) were determined. Nearly uniform distribution of the TFWT and OBT concentrations was observed in Japan, taking into account a relatively large counting error. The average values for all Japanese polished rice were 2.69 ±0.74 Bq/L for the TFWT concentration, 2.01 ±0.78 Bq/L for the OBT concentration and 0.83 ±0.32 for the specific activity ratio. The TFWT concentration was within the range of tritium concentration of the land water reported by other researchers. The specific activity ratio below unity also confirmed by analyses of the 4 Chinese polished rice samples suggests that OBT in the rice is not equilibrated with TFWT or HTO in the environment because of isotope discrimination.

著者

府馬 正一 井上 義和 宮本 霧子 武田 洋 岩倉 哲男 新井 清彦 樫田 義彦 一政 祐輔

出版者

日本アイソト-プ協会

雑誌

Radioisotopes (ISSN:00338303)

巻号頁・発行日

vol.51, no.10, pp.381-391, 2002-10-15

被引用文献数

2 2