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12 巻, 4 号
選択された号の論文の5件中1～5を表示しています
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榎本 茂正, 小野寺 敏美, 加藤 久1970 年 12 巻 4 号 p. 174-178
発行日: 1970/04/30
公開日: 2011/02/17
ジャーナル フリーThe γ-ray self-absorption factor-the ratio of γ-ray intensities between cases with and devoid of self-absorption-was determined on 192Ir radiographic sources. The two methods were devised and used for evaluating the factor: (1) a target made up of layers of thin iridium discs was neutron activated to determine the ratio of γ-ray doses between that from the laminated source and the sum of the doses from the individual discs; (2) the quantity of radioactivity of 192Ir sources was estimated by approximate theoretical calculation, and the ratio was derived from the calculated quantity and the γ-ray dose observed.
Iridium targets were irradiated in the experimental hole of JRR-2, and after decaying off the 194Ir, the γ-ray dose from the sources were observed with an ionization chamber system. The factor obtained was 0.72 for 2mm diam. ×2mm thick source by the first method, and 0.89, 0.82, 0.70 and 0.66 for 0.5×0.5, 1×1, 2×2 and 4mm diam. × 4mm thick sources respectively, by the second method. The results agreed approximately with those theoretically obtained for sources of homogeneous distribution of the radioactivity, when based on the experimentally obtained value of 3.4cm-1 for the self-absorption coefficient.抄録全体を表示PDF形式でダウンロード (2559K) -
宮本 喜晟1970 年 12 巻 4 号 p. 179-186
発行日: 1970/04/30
公開日: 2011/02/17
ジャーナル フリーThe concept of hot chonnel factor or peaking factor is generally used in the thermal design of reactor cores. The present poper defines a hot spot factor, and presents a method of calculding this factor. The uncertainties in the design variobles are classified. Statistical and cumulative treatments of the hot spot factor are discussed. Then, the method of calculating the hot spot factor is obtained for the case where the design variable does not agree wirh the mean value of the stochstic variable, and it is verified that a procedure analogous to the normal statistical treatment is applicable. As one example, the hot spot factor for a fuel element of pellets in a cladding tube is calculated by the statistical technique. In this case, a correction is necessary for the index of the variable; this correction factor is obtained for the case of a sine or cosine power distribution in the axial direction.抄録全体を表示PDF形式でダウンロード (408K) -
竹腰 英子1970 年 12 巻 4 号 p. 187-190
発行日: 1970/04/30
公開日: 2011/02/17
ジャーナル フリーA review is presented on the current status of progress in fission Studies, both experimental and theoretical. Special emphasis is laid on developments related to nuclear shell effects in the fissioning nucleus.抄録全体を表示PDF形式でダウンロード (233K) -
桂木 学, 深井 佑造, 五十嵐 信一, 中村 邦彦, 山本 正昭, 安野 武彦, 東稔 達三, 水田 宏, 和嶋 常隆1970 年 12 巻 4 号 p. 191-206
発行日: 1970/04/30
公開日: 2010/01/08
ジャーナル フリーPDF形式でダウンロード (1278K) -
立花 昭, 江連 秀夫, 入江 敏雄1970 年 12 巻 4 号 p. 207-218
発行日: 1970/04/30
公開日: 2011/02/17
ジャーナル フリーPDF形式でダウンロード (761K)
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