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-ray analysis and construction of its beam lineOshima, Masumi; Toh, Yosuke; Kimura, Atsushi; Ebihara, Mitsuru*; Oura, Yasuji*; Ito, Yasuo*; Sawahata, Hiroyuki*; Matsuo, Motoyuki*
Journal of Radioanalytical and Nuclear Chemistry, 271(2), p.317 - 321, 2007/02
Times Cited Count：11 Percentile：61(Chemistry, Analytical)By combining neutron activation analysis with multiple -ray detection, we have proved better sensitivity and resolution for the trace element analysis than the ordinary single -ray detection method. We now try to apply the multiple -ray detection method to the prompt -ray analysis (PGA). We have established a new cold neutron beam line for PGA in Japan Research Reactor, JRR-3M, at Tokai establishment of Japan Atomic Energy Research Institute(JAERI). It consists of a beam shutter, a beam attenuator, a -ray detector array, a sample changer, and a beam stopper. We construct a high-efficiency -ray detector array specially designed for this purpose. Its performance has been evaluated with the Monte Carlo simulation code, GEANT 4.5.0.
Sasajima, Fumio; Sawahata, Hiroyuki*; Onizawa, Koji*; Ichimura, Shigeju; Otomo, Akitoshi; Ito, Yasuo*; Takayanagi, Masaji
JAERI-Tech 2000-073, 49 Pages, 2000/12
JAERI-Tech-2000-073.pdf:4.43MB
no abstracts in English
Ito, Yutaka*; Hirade, Tetsuya; Hamada, Eisaku*; Suzuki, Takenori*; Ito, Yasuo*
Acta Physica Polonica A, 95(4), p.533 - 538, 1999/04
no abstracts in English
Yonezawa, Chushiro; ; ; Hoshi, Michio; Sawahata, Hiroyuki*; Ito, Yasuo*
Proc. of 9th Int. Symp. on Capture Gamma-ray Spectroscopy and Related Topics, 0, p.705 - 712, 1997/00
no abstracts in English
Yonezawa, Chushiro; ; Sawahata, Hiroyuki*; *; Hoshi, Michio; Ito, Yasuo*
Cancer Neutron Capture Therapy, 0, p.221 - 225, 1996/00
no abstracts in English
Ito, Yasuo*; F.M.H.Mohamed*; Seguchi, Tadao; *
Radiation Physics and Chemistry, 48(6), p.775 - 779, 1996/00
Times Cited Count：19 Percentile：81.64(Chemistry, Physical)no abstracts in English
; *; *; Ito, Yasuo*
Applied Surface Science, 85(2), p.229 - 238, 1995/01
Times Cited Count：11 Percentile：57.83(Chemistry, Physical)no abstracts in English
B in BNCTYonezawa, Chushiro; ; Sawahata, Hiroyuki*; *; Hoshi, Michio; Ito, Yasuo*
KURRI-TR-413, 0, p.21 - 27, 1995/00
no abstracts in English
Yonezawa, Chushiro; Ito, Yasuo*
Radioisotopes, 43(1), p.50 - 53, 1994/01
no abstracts in English
Yonezawa, Chushiro; Ito, Yasuo*
Isotope News, 0(12), p.2 - 7, 1994/00
no abstracts in English
Yonezawa, Chushiro; ; Hoshi, Michio; Ito, Yasuo*
Proc. of Int. Trace Analysis Symp. 94; ITAS 94, 0, p.81 - 84, 1994/00
no abstracts in English
Yonezawa, Chushiro; A.K.H.Wood*; Hoshi, Michio; Ito, Yasuo*; Tachikawa, Enzo
Nuclear Instruments and Methods in Physics Research A, 329, p.207 - 216, 1993/00
Times Cited Count：81 Percentile：98.22(Instruments & Instrumentation)no abstracts in English
Takamura, Saburo; Ito, Yasuo*
Physica Status Solidi (B), 172(2), p.529 - 537, 1992/08
Times Cited Count：1 Percentile：8.49(Physics, Condensed Matter)no abstracts in English
; *
Journal of Nuclear Science and Technology, 16(1), p.49 - 56, 1979/00
Times Cited Count：12no abstracts in English
Kodama, Takashi*; Nakano, Masamichi*; Matsuoka, Shingo*; Matsuura, Chihiro*; Ito, Yasuo*; Kurosu, Katsuya*; Shiraishi, Hirotsugu; Katsumura, Yosuke*
no journal, ,
It has been known that although a considerable amount of hydrogen is produced radiolytically in the high level liquid waste, only small part is emitted into the gas phase when the liquid depth is large. We report here the results of an experimental study which shows that the liquid-depth effect is caused not by the reaction between hydrogen and radicals, as has been previously suggested, but by Pd-catalyzed reaction between hydrogen and nitric acid. The method for evaluating the magnitute of the effect is also proposed.
Kodama, Takashi*; Nakano, Masanao*; Hayashi, Yoshiaki*; Matsuoka, Shingo*; Ito, Yasuo*; Matsuura, Chihiro*; Shiraishi, Hirotsugu; Katsumura, Yosuke*
no journal, ,
We have reported in the previous meeting that the accumulation of radiolytically produced hydrogen in high-level liquid waste is suppressed owing to some oxidation reaction catalyzed by Pd in the solution. In this report, we present the results of a hydrogen bubbling experiment with mock high-level liquid waste, made to clarify the species involved in the reaction. Analysis was made on nitrous acid and nitric acid in the solution, and also on nitrogen oxide in the outlet gas. It was found that although the concentration of nitrous acid present in the solution is small, nitrogen oxide, consisting mostly of NO, is detected in the gas at concentration corresponding to the decrease of nitric acid in the solution. The amount of the produced nitrogen oxide matched roughly with an estimated amount of reacted hydrogen, confirming that nitric acid is the oxidant.
Kodama, Takashi*; Nakano, Masanao*; Hayashi, Yoshiaki*; Matsuoka, Shingo*; Ito, Yasuo*; Matsuura, Chihiro*; Shiraishi, Hirotsugu; Katsumura, Yosuke*
no journal, ,
We report here an evaluation for hydrogen concentration that may be attained in the upper space of the high-level liquid waste tank when the gas sweeping function happens to be lost. The parameters are the rate of radiolytic production of hydrogen, the rate of Pd-catalyzed hydrogen consuming reaction, and the solubility of hydrogen. For the first, a literature value on nitric acid solution was used, while for the second and third, experimental estimate was made in the present study with mock high-level liquid waste. All data have been taken at ambient temperature. For simplicity, it was assumed that both the gas and the liquid are homogeneous, and that the two phases are in equilibrium regarding hydrogen concentration. These led to an estimate of 0.6% for the hydrogen concentration in the gas phase, a value smaller than the lower limit of explosion.
