質量分電計による,中性子照射二酸化ウラン中のウランならびに核分裂生成物の同位体比の測定
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概要
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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:<BR> (1)By isotopic analysis of uranium, the contribution to burnup of the specimen by fission of U<SUP>235</SUP>was determined as 4, 370 MWD/T. The loss of U<SUP>235</SUP>in neutron capture reaction during inadiation was corrected by the ratio of U<SUP>236</SUP>to U<SUP>235</SUP>.<BR> (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 U<SUP>235</SUP>mentioned above, the contribution of burnup of the specimen by fission of Pu<SUP>239</SUP> might be determined by excessive formation of fission product. As the number of fissions of Pu<SUP>239</SUP> was estimated, the burnup of the specimen was calculated as approximately 7, 980 MWD/T.<BR> (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.
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