巻号一覧
14 巻 (1966)
- 5 号 p. 241-
- 4 号 p. 149-
- 3 号 p. 105-
- 2 号 p. 59-
- 1 号 p. 1-
14 巻, 5 号
選択された号の論文の7件中1～7を表示しています
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笛木 賢二1966 年 14 巻 5 号 p. 241-250
発行日: 1966/12/25
公開日: 2010/06/28
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木島 宣明, 本田 雅健1966 年 14 巻 5 号 p. 251-256
発行日: 1966/12/25
公開日: 2010/06/28
ジャーナル フリーElectrolytic fractionation of calcium isotopes was studied using a streaming mercury cathode in relation to the cell potential. Isotopic ratios, 48Ca/42Ca, were measured by a solid-source massspectrometer MS-5 manufactured by A.E.I., England. From the observed increasing tendency of the sepration factor, a42-48;, with decreasing the cell potential, the upper limit ofαwas estimated by extrapolation as 1.0135, which was expected to be obtained at the isotopic exchange equilibrium. This value is in fact close to the equilibrium data appeared in literatures. Possible mechanisms of the fractionation were discussed.抄録全体を表示PDF形式でダウンロード (573K) -
近藤 敏郎, 渡辺 一生1966 年 14 巻 5 号 p. 257-264
発行日: 1966/12/25
公開日: 2010/06/28
ジャーナル フリーThe ion detector for a fast scanning mass spectrometer has been developed. The instrument used is a Hitachi mass spectrometer: modified RMU-6D, of a single focusing, 90° sector type. A mass range of m/e 10-500 may be magnetically scanned in 3 seconds: the peaks are recorded on strip chart of are cording galvanometer.
The ion detector is described which incorporates a electron-multiplier and a fast response electrometer. The electron multiplier consists of 10 stage Ag-Mg dynodes. The electrometer has the feedback resistor sorunded a metal sleeve which is connected the output of the amplifier through a P.I.D. network and the response speed is increased.
The response and the noise of the ion detector are discussed. Design procedures led from the discussion and the complete circuits are given. The ion detector can be used in measurement of current from 2.5×10-11 to 1×10-14 amperes and the 90% inditial response is 40 microseconds.抄録全体を表示PDF形式でダウンロード (3723K) -
井上 清, 小林 唯男, 谷口 薫1966 年 14 巻 5 号 p. 265-274
発行日: 1966/12/25
公開日: 2010/06/28
ジャーナル フリーA fundamental study was performed on the mass spectrometric determination of the ratios of uranium and fission products in the uranium dioxide specimen irradiated in the nuclear reactor. Mass spectrometer used in this experiment was a 90° sector type with a 350 mm radius of curvature, made by Hitachi, Ltd. In the period of the experiment, this spectrometer was equipped with a thermal-ionization source. The specimen dissolved in nitric acid was pipetted and evaporated to dryness on a filament, and then was analysed in the single filament arrangement. From the results it has been found that:
(1)By isotopic analysis of uranium, the contribution to burnup of the specimen by fission of U235was determined as 4, 370 MWD/T. The loss of U235in neutron capture reaction during inadiation was corrected by the ratio of U236to U235.
(2)The burnup of the specimen can be determined from the amount of a fission product formed during irradiation. Because of known contribution of the burnup by fission of U235mentioned above, the contribution of burnup of the specimen by fission of Pu239 might be determined by excessive formation of fission product. As the number of fissions of Pu239 was estimated, the burnup of the specimen was calculated as approximately 7, 980 MWD/T.
(3)Experience with the mass spectrometric analysis was obtained for the radioactive specimen. The noticeable phenomenon was the increase in the emissivity of ion current at relatively law heating current through filament under the existence of beta-rays emitter.抄録全体を表示PDF形式でダウンロード (1012K) -
小西 文弥, 草尾 健司, 中村 信雄1966 年 14 巻 5 号 p. 275-284
発行日: 1966/12/25
公開日: 2010/06/28
ジャーナル フリーThe correct emulsion characteristic curve was constructed by plotting isotopic abundance against Seidel function obtained from the isotopic lines of Sn+;spectra taken on a single plate at three different exposures, (Fig. 1). The monitor current during the exposure was always kept below 1×10-13A which had been found necessary in our laboratory to avoid the broading of spectral lines, a condition essential to construct a correct characteristic curve. It is to be noted in this connection that a certain microphotometer gave a false result that the line width at half intensity decreased with density though in fact it remained constant.
Employing the characteristic curve thus obtained, constancy of ion quantity and exactness isotopic abundance measurement were examined by the use of a number of zinc or carbon spectra taken all over a single Ilford Q 2 plate both by changing magnetic filed strength and by vertically displacing the plate, (Fig. 1). All these spectra were taken at constant exposure by keeping the monitor current below 1×10-13A.
Results. The ion quantities* obtained of zinc and carbon isotopes were found constant within ±5 percent. The isotopic abundance of zinc was exact within ±2 percent absolute. *Here ion quantity means a quantity proportional to the number of ions that have arrived at the line position.抄録全体を表示PDF形式でダウンロード (3161K) -
天然繊維の熱分解生成物の質量分析平松 勤司1966 年 14 巻 5 号 p. 285-297
発行日: 1966/12/25
公開日: 2010/06/28
ジャーナル フリーGaseous and volatile materials, produced from the pyrolysed natural fibers (cotton, wool and silk) under various conditions, were analysed qualitatively and quantitatively by the mass spectroscopy. The following conclusions were deduced:
1) The products were containing H2, CO2, lower hydrocarbons and others.
2) The amounts of produced gas were not recognized a great deal of difference among the sorts of natural fibers.
3) At the range of 300°C and 800°C, a hydrogen cyanide increased as the temperature raised, but ammonia and acetic acid reached to the maximum amount at about 400°C and decreased with a more increase in temperature gradually.
4) It was indicated that a hydrogen cyanide was produced more easily in air than in N2, gas atmosphere.
5) A CO gas was not recognized a great deal of difference in amount among the natural fibers.
6) Comparing about the dyed and the not dyed one by reactive dye, it was supposed that the components of the pyrolytic products were affected by dyeing.抄録全体を表示PDF形式でダウンロード (1193K) -
1966 年 14 巻 5 号 p. 298
発行日: 1966/12/25
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (80K)
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