巻号一覧
後続誌
3 巻, 5 号
選択された号の論文の12件中1～12を表示しています
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八巻 秀雄1961 年 3 巻 5 号 p. 323-328
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリーThe neutron absorption cross sections and the induced radioactivities of some samples of 2S and 52S aluminium have been determined by the activation method and results were compared. The samples examined were produced by three different Japanese makers.
For the cross sections, no significant difference was observed among these makers. The values for the 2S and 52S samples were 1.43×10-2cm-1 and 1.39×10-2cm-1 respectively; one of the 52S sample being about 2% larger than other 52S samples.
There were some differences short life activities among the samples. The maximum activities were roughly 10 times that of the minimum, but after 10hr from the end of irradiation, the maximum values came down to double the minimum. These differences resulted from different contents of Cu, Mn, Ga and Zn in each sample.
In this test, integrated neutron fluxes in JRR-1 were 2.39×1015n/cm2 and 1.31×1016n/cm2. Gamma-ray spectrum and its time dependence were measured for each sample by a 256-channel pulse height analyzer.抄録全体を表示PDF形式でダウンロード (389K) -
実験結果鈴木 辰三郎1961 年 3 巻 5 号 p. 329-332
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリーヘビーメタルのスリットからでるうすいγ線のsheetを用いてガイガー計数管の部分的計数効率を測定した。この実験結果を第I報(1)で行なった計算結果と比較した。この実験では部分的計数効率は計数管の内面とγ線の進行方向とのなす角度によって大きく変化する。また部分的計数効率の最大値は計数管の内径の大きさによって変化することがわかった。抄録全体を表示PDF形式でダウンロード (193K) -
γ線スペクトル法による核分裂生成物の新分析法服部 一郎1961 年 3 巻 5 号 p. 338-343
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリーMany references have been published for analyzing fission product mixtures by the gamma-ray spectrometry.
Though they simplify more both time and procedure for analyzing vastly than the radiochemical separations methods, tedious processing for decomposition of spectra into components or delicate instrumental devices for automatic removing unfavorable pulses in photo-peaks are required to obtain quantative results of the composition.
The method written here is less elegant, but more simple and easier than the methods pre-mentioned. The processing consists of three parts.
In the first stage of processing, the gamma-ray spectra of the samples are compared with the standard gamma-ray spectra which are predicted by the calculation and examined by the observation of known fission products. Being or not of specific peaks on the spectra and relative height of the peaks are the principal guides for deduction of apparent ages of samples.
In the second stage of processing, the published charts or tables of relative abundances of fission products as functions of time after fission are used to determine the composition of the samples.
In the third stage of processing, the absolute activities of individual radionuclides are calculated from measured gamma counting rates of samples by the following equation:
a(t)=n(t)·A(t)/N(t)
a(t): activity of individual radionuclide in the sample (dps)
n(t): measured gamma counting rate of the sample (cps)
A(t): activity of individual fission product predicted by the calculation (dphr/100fiss.)
N(t): gamma counting rate of fission product mixture predicted by the calculation (cphr/100fiss.)抄録全体を表示PDF形式でダウンロード (344K) -
TBP-塩酸系における核分裂生成物のカウンタ・カレント抽出分離石森 富太郎, サムール Ｈ．Ｍ．1961 年 3 巻 5 号 p. 344-352
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリークレイグ式カウンタ・カレント抽出法の放射性核種分離への応用を試みた。100%TBP-塩酸系において,主要なF. P. 核種個々の行動を調べたのち, 100～200日冷却したF. P. 混合物から,その構成核種2, 3の分離を試み,ジルコニウムとニオブの相互分離・ジルコニウムーニオブのルテニウムおよびその他のF. P. からの分離などにおける最適条件を研究した。抄録全体を表示PDF形式でダウンロード (586K) -
石原 健彦, 見塩 規行, 角谷 省三, 山本 寛1961 年 3 巻 5 号 p. 353-359
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリーThe removal of long-life fission-products, especially of 137Cs, 90Sr and 106Ru was studied by jar-testers and slurry recirculation type flocculators. (1l/min, ACCELATOR)
Bentonite-polyelectrolyte coagulation was found most effective for 137Cs removal, phosphate coagulation for 90Sr removal and sulfide coagulation for 106Ru removal. Any coagulant employed can remove 144Ce end 95Zr significantly.
Better removal of contaminants from mixtures of 137Cs, 90Sr and 106Ru were obtained by two-step coagulation with the combination of bentonite-polyelectrolyte and phosphate and/or sulfide. The best is the phosphate coagulation followed by bentonitepolyelectrolyte coagulation.
Slurry recirculation type flocculator can remove contaminants with less chemicals compared with jar-tester. With this flocculator less than 1 hr was necessary to restore the slurry state from the disturbance caused by wrong feeding of chemicals.
Various processes were applied to the reduction of sludge volume produced by coagulation, and freezing treatment was found most effective to reduce the volume to 1% or less of the original waste volume.抄録全体を表示PDF形式でダウンロード (417K) -
球状水酸化トリウムの生成条件山崎 弥三郎, 吉田 健三, 小守 松雄1961 年 3 巻 5 号 p. 360-364
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリーThorium hydroxide slurry containing a small extent of thorium nitrate became a yellow sol when heated on the water-bath for several hours. Spherical thorium hydroxides made by spraying this sol through a nozzle into certain organic solvents, were heated higher than 260°C to get spherical oxides.
Several experiments performed to find the optimum conditions and the mechanism of the formation of the microspheres. Iso-propyl alcohol is the best solvent and the mixture of ethyl alcohol and iso-buthyl alcohol (2:3) also effective. Preferable sol to solvent ratio is about 1:10. It is necessary that the sol concentration is greater than 1.5M and the water content in the alcohol is smaller than 10%. Controlling the spray speed of the sol it is possible to produce the spherical particles up to 5060 μ in diameter.抄録全体を表示PDF形式でダウンロード (5516K) -
神原 豊三1961 年 3 巻 5 号 p. 365-370
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリーPDF形式でダウンロード (549K) -
1961 年 3 巻 5 号 p. 371-384
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリーPDF形式でダウンロード (832K) -
1961 年 3 巻 5 号 p. 385-387
発行日: 1961/05/30
公開日: 2009/03/26
ジャーナル フリーPDF形式でダウンロード (210K) -
1961 年 3 巻 5 号 p. 387a
発行日: 1961年
公開日: 2009/03/26
ジャーナル フリーPDF形式でダウンロード (56K) -
1961 年 3 巻 5 号 p. 387b
発行日: 1961年
公開日: 2009/03/26
ジャーナル フリーPDF形式でダウンロード (56K) -
1961 年 3 巻 5 号 p. 387c
発行日: 1961年
公開日: 2009/03/26
ジャーナル フリーPDF形式でダウンロード (56K)
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