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13 巻, 7 号
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栢 明, 広木 俊男1971 年 13 巻 7 号 p. 366-373
発行日: 1971/07/30
公開日: 2010/01/08
ジャーナル フリーA description is given of observation by extraction and spectrophotometry on the oxidation of Pu(III) by aeration and also on the reduction of Pu(IV) with various concentrations of reducing agents and of nitric acid.
Observations were also made on the reduction of Pu(IV) and (VI) extracted in TBP and DBP phases with both nitrous acid and hydrogen peroxides. Further, the adaptability of these reagents to separation and purification of Pu from U and the correct amounts of the reagents required for adjusting the Pu valency were studied.
Oxidation of Pu(III) by aeration quite evident in low acid solution, but insignificant at concentrations above 2.0M nitric acid.
The most suitable concentrations of nitric acid for the reduction of Pu(VI) by nitrous acid (-0.5M) was below 0.2M. A percentage reduction in the range of 68-85% was observed on the Pu by nitrous acid in TBP phase after 5min, so that the method is quite promising for application to the purification of Pu.
A nitric acid concentration of 4.0M assured 100% conversion to Pu(IV) with an equimolor amount of hydrogen peroxide, while 100% of Pu(III) was obtained on the other hand with hydrogen peroxide added to an amount 10-20 times of the Pu.
In TBP phase the reduction percent of Pu by hydrogen peroxide was only in the range of 35-50% after 20min, which is significantly inferior to nitrous acid.抄録全体を表示PDF形式でダウンロード (471K) -
高柳 弘, 足立 守1971 年 13 巻 7 号 p. 374-379
発行日: 1971/07/30
公開日: 2009/04/21
ジャーナル フリーThis report describes a nondestructive measurement on average burnup of irradiated fuel rods with use of a Ge(Li) detector. In order to obtain the average burnup directly and to simplify measurement and analysis, the γ-ray spectrum from the irradiated fuel rod was measured by scanning along the whole length of the rod. The total absorption peaks for the 0.662MeV (137Cs) and the 2.18MeV (144Pr) γ-rays were used in the analysis, and the peak areas were estimated by Covell's method. The absolute value of overqge burnup was determined by comparison of the peak area with that of a standard fuel rod.
The accuracy of the nondestructive measurement is discussed on the basis of an accurate value from destructive analysis. The result shows that it is possible to give the average burnup with good accuracy when the ratio of the peak height for 137Cs to the Compton background is larger than about 1.5, that is, after about 1 year of cooling.抄録全体を表示PDF形式でダウンロード (3009K) -
江藤 秀雄1971 年 13 巻 7 号 p. 380-386
発行日: 1971/07/30
公開日: 2010/01/08
ジャーナル フリーThe general effects of ionizing radiations at cellular and organ levels are briefly outlined. The effects resulting from radiation are somatic and/or genetic. The latter effect may manifest itself not in the exposed individual, but in his immediate or in his later descendants. This report deals mainly with the biological evaluqtion of the somatic effects. Dose-response relationships are discussed, with particular reference to late effects. Some typical examples are given. Also presented are some consideration that may contribute to the biologica1 evaluation of the radiation effects.抄録全体を表示PDF形式でダウンロード (536K) -
岡島 暢夫, 重松 友道, 河合 保彦, 東原 義治1971 年 13 巻 7 号 p. 387-409
発行日: 1971/07/30
公開日: 2010/03/08
ジャーナル フリーPDF形式でダウンロード (4040K) -
大内 金二1971 年 13 巻 7 号 p. 410-411
発行日: 1971/07/30
公開日: 2009/04/21
ジャーナル フリーPDF形式でダウンロード (120K)
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