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35 巻, 5 号
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木村 逸郎, 藤田 薫顕, 白井 英次, 神田 啓治, 三嶋 豊, 高橋 秀武, 小林 久夫, 安田 秀志, 飯田 浩正, 有冨 正憲, 石 ...1993 年 35 巻 5 号 p. 366-392
発行日: 1993/05/30
公開日: 2010/03/08
ジャーナル フリーPDF形式でダウンロード (10471K) -
大江 俊昭, 安 俊弘, 池田 孝夫, 菅野 毅, 千葉 保, 塚本 政樹, 中山 真一, 長崎 晋也1993 年 35 巻 5 号 p. 420-437
発行日: 1993/05/30
公開日: 2010/01/08
ジャーナル フリーThis paper describes the validity of two assumptions usually accounted for performance analyses of engineered barriers; nuclide release starts at 1, 000 yr after backfilling of packages, and the chemical environment around the package is kept under a reducing condition. Analyses by several computer codes such as TOUGH, PHREEQE and CHEMSIMUL were conducted to estimate the followings: the time at which the buffer material is fully saturated with water, geochemical conditions of the pore water, and hydrogen gas production due to package corrosion and to water radiolysis. Calculation results indicate, if bentonite is used as buffer material, that the buffer layer becomes saturated within several decades and that a reducing environment is accomplished due to mineral oxidation reactions in bentonite, with resulting in less corrosion of waste packages than expected from the previous experimental corrosion data. Hydrogen production due to package corrosion by the pore water is more dominant than that by steam corrosion or water radiolysis, and further discussion is still required for specifying the possible mechanical and chemical effects on the engineered barrier system due to produced hydrogen.抄録全体を表示PDF形式でダウンロード (10094K) -
藤間 正博, 西尾 良司, 土田 一輝, 鈴木 一道1993 年 35 巻 5 号 p. 438-443
発行日: 1993/05/30
公開日: 2011/02/17
ジャーナル フリーThe laser induced fluorescence technique has been used to determine the population ratio of three metastable states, 620, 4, 275 and 7, 005cm-1, to the ground state of 238U which was evaporated into vacuum by electron beam heating. The population ratio of metastable states of 620, 4, 275 and 7, 005cm-1 decreased by increasing the temperature of evaporation surface in the range of 2, 700-3, 000K, and the rate of decrease was larger for the metastable states with higher energies. Excitation temperatures of the metastable states, 4, 275 and 7, 005cm-1 were 4, 500 and 3, 300K, respectively, at the surface temperature of melt, 2700K, and were higher than the surface temperature of melt. The excitation temperatures were cooled down rapidly to 2, 800 and 2, 200K, respectively, by increasing the surface temperature to 3, 000K.
The experimental results indicate that 238U atoms are excited not only by thermal excitation but also by electron impact excitation. Relaxation of metastable atoms is due to the collision of atoms of which density above the evaporation surface increases with the increase of the surface temperature.抄録全体を表示PDF形式でダウンロード (2257K)
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