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Nakamura, Shoji; Endo, Shunsuke; Kimura, Atsushi; Shibahara, Yuji*
KURNS Progress Report 2020, P. 94, 2021/08
The present study selected Np among radioactive nuclides and aimed to converge a contradiction between reported thermal-neutron capture cross sections. Neutron irradiation was carried out using the graphite thermal column equipped with the Kyoto University Research Reactor. A solution equivalent to 950 Bq order of radioactivity was pipetted out of a Np standard solution and dropped onto a fiber filter, which was then dried with an infrared lamp to prepare a Np sample. The Np sample was quantified using 312-keV gamma ray emitted from Pa in a radiation equilibrium with Np. To monitor a thermal-neutron flux component at an irradiation position, the Np sample was irradiated together with several stable nuclides as neutron flux monitors: Sc, Co, Mo, Ta and Au. The reaction rate of Np was obtained from gamma-ray yields given by Np and Pa, and then the thermal-neutron capture cross section of Np was derived.
Oshima, 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
Isotope News, (602), p.26 - 27, 2004/06
no abstracts in English
Yonezawa, Chushiro; Matsue, Hideaki
Bunseki, 2004(2), p.75 - 82, 2004/02
no abstracts in English
Ueno, Takashi; Amano, Hikaru
JAERI-Data/Code 2003-004, 49 Pages, 2003/03
This report presents the data of deposition of radionuclides (Sep. 1993-March 2001) and stable elements (Sep.1993-Oct.1995) in Tokai-mura. To evaluate the migration of radionuclides and stable elements migration from the atmosphere to the ground surface, atmospheric deposition samples were collected from 1993 to 2001 with three basins (distance to grand surface were 1.5m, 4m, 10m) set up in the enclosure of JAERI in Tokai-mura, Ibaraki-ken, Japan. Monthly samples were evaporated to dryness to obtain residual samples and measured with a well type Ge detector for 7Be, 40K, 137Cs and 210Pb. According to the analysis of radioactivity, clear seasonal variations with spring peaks of deposition weight (dry) and deposition amounts of all objective radionuclides were found. Correlation analysis of deposition data also showed that these radionuclides can be divided into two groups. A part of dried sample was irradiated to reactor neutrons at JRR-4 for determination of stable element's deposition.
Toh, Yosuke; Hatsukawa, Yuichi; Oshima, Masumi; Shinohara, Nobuo; Hayakawa, Takehito; Kushita, Kohei; Ueno, Takashi
Health Physics, 83(1), p.110 - 113, 2002/07
Times Cited Count:10 Percentile:54.8(Environmental Sciences)no abstracts in English
Oshima, Masumi; Toh, Yosuke; Hatsukawa, Yuichi; Hayakawa, Takehito; Shinohara, Nobuo
Journal of Nuclear Science and Technology, 39(4), p.292 - 294, 2002/04
Times Cited Count:18 Percentile:73.17(Nuclear Science & Technology)no abstracts in English
Hatsukawa, Yuichi; Oshima, Masumi; Hayakawa, Takehito; Toh, Yosuke; Shinohara, Nobuo
Nuclear Instruments and Methods in Physics Research A, 482(1-2), p.328 - 333, 2002/04
Times Cited Count:25 Percentile:81.45(Instruments & Instrumentation)no abstracts in English
Oshima, Masumi; Hatsukawa, Yuichi; Toh, Yosuke; Hayakawa, Takehito; Shinohara, Nobuo
Kagaku To Kyoiku, 49(9), p.552 - 553, 2001/09
no abstracts in English
Hatsukawa, Yuichi; Toh, Yosuke; Oshima, Masumi; Hayakawa, Takehito; Shinohara, Nobuo; Kushita, Kohei; Ueno, Takashi
KEK Proceedings 2001-14, p.193 - 194, 2001/06
no abstracts in English
Yonezawa, Chushiro
Non-Destructive Elemental Analysis, p.58 - 114, 2001/06
no abstracts in English
Hatsukawa, Yuichi; Oshima, Masumi; Hayakawa, Takehito; Toh, Yosuke; Shinohara, Nobuo
Journal of Radioanalytical and Nuclear Chemistry, 248(1), p.121 - 124, 2001/04
Times Cited Count:6 Percentile:44.06(Chemistry, Analytical)no abstracts in English
Oshima, Masumi; Toh, Yosuke; Hayakawa, Takehito; Hatsukawa, Yuichi; Shinohara, Nobuo
JAERI-Conf 2001-002, p.532 - 534, 2001/03
no abstracts in English
Kaneko, Junichi; Yonezawa, Chushiro; Kasugai, Yoshimi; Sumiya, Hitoshi*; Nishitani, Takeo
Diamond and Related Materials, 9(12), p.2019 - 2023, 2000/12
Times Cited Count:9 Percentile:47.87(Materials Science, Multidisciplinary)no abstracts in English
Oshima, Masumi
Isotope News, (553), p.8 - 10, 2000/06
no abstracts in English
Oshima, Masumi
Look Japan, 5, p.30 - 31, 2000/06
no abstracts in English
Hatsukawa, Yuichi; Oshima, Masumi; Hayakawa, Takehito; Toh, Yosuke; Shinohara, Nobuo
Hoshaka Bunseki, (10), p.19 - 20, 2000/03
no abstracts in English
Hatsukawa, Yuichi; Hayakawa, Takehito; Toh, Yosuke; Shinohara, Nobuo; Oshima, Masumi
CP495, Experimental Nuclear Physics in Europe, p.429 - 430, 1999/11
no abstracts in English
Yonezawa, Chushiro; Ichimura, Shigeju; *; Matsue, Hideaki
JAERI-Tech 98-046, 79 Pages, 1998/11
no abstracts in English
Yonezawa, Chushiro; *; Matsue, Hideaki
Bunseki Kagaku, 47(11), p.829 - 834, 1998/00
no abstracts in English