Tatsuo Matsuura
Rikkyo University
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Featured researches published by Tatsuo Matsuura.
Journal of Radioanalytical and Nuclear Chemistry | 1989
Tatsuo Matsuura; K. Sasaki; H. Shoji
Copper phthalocyanine (α and β forms) in neat solid or in dissolved state in conc. H2SO4 was neutron-irradiated, and retention values of64Cu and66Cu were estimated to study whether or not there is any isotope effect in retention between these two (n, γ)-produced radionuclides. The data show that there is an isotope effect expressed by the ratio of retention of66Cu to that of64Cu, ranged from 1.29±0.12 for α form dissolved in conc. H2SO4 to 1.09±0.02 for β form in neat solid irradiation. This result coincides with the tendency anticipated from the recoil energy spectra which were computed by a program using Monte-Carlo method.
Archive | 1987
Hisao Kobayashi; Susumu Harasawa; Kenji Tomura; Y. Takami; Fumio Shiraishi; Manabu Hattori; Teruaki Nagahara; Tatsuo Matsuura; Iwao Ogawa; Yusuke Yamamoto
A vertical diverging collimator is installed in the reactor tank of Rikkyo 100 kW TRIGA-II. The configuration of the collimator and the beam characteristics are summarized. The ASTM E545-81 sensitivity and beam purity indicators have shown that the collimator is qualified to be the category I. Inherent unsharpness for the combination of the 25 pm Gd screen and the KODAK-SR film is determined experimentally and found to be 48.0±0.5 µm. An application is given for the inspection of mold cavities in carburetors.
Radiochimica Acta | 1965
Tatsuo Matsuura; Yoshihiro Sensui; Takashi Sasaki
In der Literatur ist die Zersetzung von Methan und Äthan durch Hochfrequenzentladungen als eine Reaktion 1. Ordnung beschrieben [14, 15]. Der von uns gefundene Verlauf des Methanzerfalls kann zunächst eine Reaktion 1. Ordnung vortäuschen, wenn p 1, wie die logarithmische Darstellung des Methanzerfalls (Abb. 8) zeigt (vgl. dagegen auch Abb. 6b, p = 0,3). Die dargelegten Vorstellungen über den Mechanismus des Methanzerfalls gründen sich nicht nur auf Messungen der Methanzersetzung sondern auf die bei der Methantritierung beobachtete zeitliche Abhängigkeit der Maximumslagen von der Zusammensetzung des Ausgangsgemisches, mit der ein Reaktionsverlauf 1. Ordnung bei der Methanzersetzung nicht in Einklang gebracht werden kann. Die Zersetzungsreaktion ist dem Abb. 8. Ix)garithmische Darstellung des MethanzerfaUs nach dcM Funktion = f t) k, c«; (a) p = 0,3; (b) i) = 1
Journal of Radioanalytical and Nuclear Chemistry | 1990
Tatsuo Matsuura; H. Takenawa; T. Suzuki; R. Hirota; K. Sasaki
The lowest retention values of51Cr hot atom in various forms of the β-diketonetype complexes, Cr(bzac)3, Cr(dpm)3 and Cr(dbm)3, as well as Cr(acac)3 as a reference, were obtained in the experimental condition in which they are regarded as the primary retentions. From these retention values, the threshold energies for producing a hot atom, the “appearance energies”, were estimated using the calculated relationship between the primary retention and appearance energy, which was obtained by the recoil energy spectra computed by the method recently developed by us. The appearance energy increased steeply with increasing molecular weight of the complex. A theoretical interpretation for this result was attempted by setting a model in which a hot atom is produced in the center of the complex and receives the stopping action by the surrounding ligand molecule. The agreement between the observed and calculated values was good.
Journal of Radioanalytical and Nuclear Chemistry | 1986
Tatsuo Matsuura; H. Kurihara; Teruaki Nagahara; K. Sasaki
Recoiling behaviour of55Cr produced by54Cr/n, γ/55Cr reaction was studied by choosing solid Cr/acac/3 or its benzene solution as target material and by using rapid separation technique. The approximate retention value /“R-value”/ of55Cr, defined as the percentage of the activity retained in the benzene phase which was not extracted with an oxalic acid solution, was found to be higher than that of55Cr for practically all experimental runs tested /15 runs/. The ratio (55Cr/51Cr) was 1.115±0.027.
Journal of Nuclear Science and Technology | 2001
Shu A. Hayashi; Tatsuo Matsuura; Kenji Tomura; Susumu Harasawa; Ken-ichi Sasaki
Studies have been made for developing a sensitive device for monitoring possible release of fission products from fuel elements of a pool-type research reactor. Gas bubbles were introduced into the reactor-coolant water to extract dissolved fission rare gases, 89Kr and 138Xe, and their daughter nuclides, 89Rb and 138Cs, were counted with high efficiency. Various causes that influence the efficiency of extracting the rare gases and of collecting the daughter nuclides were studied by two methods: (1) a “filter method”, in which the air covering water was sucked and the daughter nuclides were caught onto a filter paper, and (2) a “bottle method”, in which the bubbled gas was sampled into a bottle, and the gas was later washed with water, and the activities on the filter or of the water were counted. The items affecting the efficiency of extraction include the flow rate of gas introduced, the position (the depth and the radial direction) of the gas exit in the reactor water, and whether the coolant was circulated or not. Analysis was made of the effect of the depth on the extraction efficiency of dissolved gas into bubbles. On the basis of these results, a fuel-monitoring device for routine use was tentatively designed, both in the filter and in the bottle methods, and tests were made. The filter method was found to be unsatisfactory for practical use. The bottle method enabled an automatic system which functions well enough to be used as a fuel-failure monitoring device.
Journal of Nuclear Science and Technology | 1968
Tatsuo Matsuura; Akira Ishiwara
As a contribution to the dynamic irradiation-elution method using ion-exchanger, in which, during the progress of irradiation, the product resulting from irradiation is immediately separated upon recoil from the complex-ion target adsorbed on an ion-exchanger, the concentration of the separable recoiling species remaining in the bead and the film of the ion-exchanger in stationary condition was derived theoretically as a function of bead radius, with parameters to account for various others factors such as initial yield, film thickness, recombination rate constant of the recoiling species, and their diffusion coefficients. The equation derived for the separable yield was applied successfully to the analysis of experimental results obtained on trioxalatochromium ion adsorbed on an ion-exchange resin.
Radiochimica Acta | 1984
Yoshihiro Sensui; Kenji Tomura; Tatsuo Matsuura
Bulletin of the Chemical Society of Japan | 1965
Yoshihiro Sensui; Tatsuo Matsuura
Journal of Nuclear Science and Technology | 1979
Kazushige Nishizawa; Yoshimitsu Morita; Mutsuaki Shinagawa; Yoshihiro Sensui; Tatsuo Matsuura