巻号一覧
後続誌
7 巻, 9 号
選択された号の論文の9件中1～9を表示しています
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梅田 巌1965 年 7 巻 9 号 p. 480-484
発行日: 1965/09/30
公開日: 2009/03/31
ジャーナル フリーThe purpose of this paper is to obtain experimentally dose build-up factors for transmitted γ-rays from an infinite line isotropic source through an infinitely extensive slab placed in parallel with the source.
In the measurements, an alternative arrangement was adopted, giving results equivalent to the line isotropic geometry with a point isotropic source (about 1 Ci 60Co and 137Cs), an air equivalent cylindrical ionization chamber (3 cm in diameter by 200 cm long) and iron plates (182.9cm×91.4cm×0.555.00 cm thick).
Up to 1 mean free path slab thickness, the dose build-up factor of the combination of infinite line isotropic source with infinitely extensive iron slab is the same as that with infinite iron medium. For thicknesses of 13 mean free paths, it is smaller with the former combination by about 7%. In excess of 3 mean free paths, the dose build-up factor of a point isotropic source in an infinite iron medium can be used instead of the infinite line source-infinite slab combination without causing errors beyond 5%.抄録全体を表示PDF形式でダウンロード (352K) -
真室 哲雄, 藤田 晃, 松並 忠男1965 年 7 巻 9 号 p. 485-492
発行日: 1965/09/30
公開日: 2009/03/31
ジャーナル フリーHighly radioactive fallout particles from the first Chinese nuclear test explosion have been examined microscopically. The observed results, shown in Table 1, Photo. 2 and Fig. 2, are compared with those obtained on the highly radioactive fallout particles originating from the Russian nuclear test explosions carried out in the autumns of 1961 and 1962. Some differences, as listed below, were found between the two cases and considered to be due to the fact that the Chinese explosion was on land and of small scale while the Russian ones were in air and of large scale.
(1) The Chinese particles, as compared to the Russian ones, were much smaller in specific activity at a given age.
(2) The diameter of the Chinese particles ranged up to as large as 20μ, while the largest of the Russian particles was about 15μ in diameter.
(3) Among the Chinese particles that were examined there were several which had divided coloring (two or more zones), but there were very few such particles among the Russian particles.
(4) The relation between volume and activity was not so clearly linear with the Chinese particles as in the case of the Russian particles.抄録全体を表示PDF形式でダウンロード (1878K) -
137Cs, 60Coおよび131lの汚染に対する考察和達 嘉樹, 田代 晋吾, 井上 義教, 村松 三男1965 年 7 巻 9 号 p. 492-495
発行日: 1965/09/30
公開日: 2009/03/31
ジャーナル フリーExperiments were carried out to determine the surface and interior contaminations in layers of fresh pig skin which had been soiled with 137Cs, 60Co and 131l solutions of various acidities and for various periods of soiling time.
It was observed that the surface contamination by acidic 60Co solution does not depend to any appreciable extent on the location of skin specimen or on the type of anion of the acid in the contaminant solution. An alkaline medium was found to increase surface contamination by cationic contaminant and to decrease that by anionic. It was found that the interior contamination is almost negligible, regardless of either the contaminant species or acidity, or of soiling time.抄録全体を表示PDF形式でダウンロード (248K) -
北爪 光幸1965 年 7 巻 9 号 p. 496-498
発行日: 1965/09/30
公開日: 2009/03/31
ジャーナル フリーPDF形式でダウンロード (2227K) -
東海発電所コールダーホール型原子炉の燃料今井 隆吉1965 年 7 巻 9 号 p. 499-505
発行日: 1965/09/30
公開日: 2009/03/31
ジャーナル フリーPower reactor fuel requires a number of special considerations. These include: (1) Economic factors such as fabrication cost and fuel cycle cost and very severe operating conditions due to decreasing designed thermal margin; (2) quality control problems raised by requirements of mass production, which on one hand affect fabrication cost, and on the other, relates to questions like engineering hot channel factor; (3) reliability requirements that widen the time gap between the newest fuel technology and present day fuel design.
The Japan Atomic Power Co. has experienced these problems with its Tokai (hollow, natural uranium metal, Magnox) fuel R & D program, and are also experiencing similar questions related to light-water reactor. The fabrication of power reactor fuel in Japan is the topic of the time, and this article explains the actual experience with the Tokai fuel. The mode of swelling of tubular fuel, creep collapse of U under coolant pressure, and end welding of the tube were three new problems unexperienced in U. K. reactors. Deformation of heat transfer surfaces, post irradiation examination, inspection experiences at the Springfields Works, and interpretation of the specifications are also discussed. Part II will deal with light water reactor fuel.抄録全体を表示PDF形式でダウンロード (1172K) -
中村 康治1965 年 7 巻 9 号 p. 506-510
発行日: 1965/09/30
公開日: 2009/03/31
ジャーナル フリーThe nuclear fuel problem is extremely important in Japan, which has scanty resources in the face of a rapidly expanding demand. Imported uranium must be used as effectively as possible. Blending of enriched uranium with depleted uranium (extracted from spent fuel of light water reactors and still possessing a higher 235U concentration than natural uranium) is shown to be economically practical and advisable. Further, the utilization of plutonium and the re-enrichment of depleted uranium should provide large savings in enriched uranium to be imported.抄録全体を表示PDF形式でダウンロード (1223K) -
1965 年 7 巻 9 号 p. 511-512
発行日: 1965/09/30
公開日: 2009/03/31
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1965 年 7 巻 9 号 p. 513-519
発行日: 1965/09/30
公開日: 2009/03/31
ジャーナル フリーPDF形式でダウンロード (552K) -
丸山 正倫1965 年 7 巻 9 号 p. 520-522
発行日: 1965/09/30
公開日: 2009/03/31
ジャーナル フリーPDF形式でダウンロード (282K)
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