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Journal Articles

Radioactive tracer $$^{132}$$Cs (TRACs) for Fukushima Nuclear Power Plant accident

Nagai, Yasuki; Makii, Hiroyuki; Namiki, Shinji; Iwamoto, Osamu; Iwamoto, Nobuyuki; Sawahata, Hiroyuki*

Journal of the Physical Society of Japan, 81(8), p.085003_1 - 085003_2, 2012/08

 Times Cited Count:1 Percentile:10.83(Physics, Multidisciplinary)

We propose to use the radionuclide $$^{132}$$Cs as a tracer. $$gamma$$-ray energy of the most intense line from the decay of $$^{132}$$Cs is 668 keV, which is very near to that of the 662 keV from the decay of $$^{137}$$Cs, while the half-life of $$^{132}$$Cs is 6.5 d. $$^{132}$$Cs can be produced by nuclear reactions such as $$^{133}$$Cs(n,2n)$$^{132}$$Cs, $$^{133}$$Cs(r,n)$$^{132}$$Cs or $$^{132}$$Xe(p,n)$$^{132}$$Cs. The $$^{132}$$Cs tracer would be useful in the quantitative studies of radionuclide $$^{137}$$Cs contaminant in human, and in any experimental studies in the minimization of radionuclide $$^{137}$$Cs contamination in agricultural and stock farming products.

Journal Articles

Multiple prompt $$gamma$$-ray analysis and construction of its beam line

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:61.24(Chemistry, Analytical)

By combining neutron activation analysis with multiple $$gamma$$-ray detection, we have proved better sensitivity and resolution for the trace element analysis than the ordinary single $$gamma$$-ray detection method. We now try to apply the multiple $$gamma$$-ray detection method to the prompt $$gamma$$-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 $$gamma$$-ray detector array, a sample changer, and a beam stopper. We construct a high-efficiency $$gamma$$-ray detector array specially designed for this purpose. Its performance has been evaluated with the Monte Carlo simulation code, GEANT 4.5.0.

JAEA Reports

The Verification of neutron activation analysis support system (Cooperative research)

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

Journal Articles

Prompt gamma-ray analysis using cold and thermal guided neutron beams at JAERI

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

Journal Articles

Application of neutron-induced prompt gamma-ray analysis for determination of B-10 in BNCT

Yonezawa, Chushiro; ; Sawahata, Hiroyuki*; *; Hoshi, Michio; Ito, Yasuo*

Cancer Neutron Capture Therapy, 0, p.221 - 225, 1996/00

no abstracts in English

Journal Articles

Application of neutron-induced prompt gamma-ray analysis for determination of $$^{10}$$B in BNCT

Yonezawa, Chushiro; ; Sawahata, Hiroyuki*; *; Hoshi, Michio; Ito, Yasuo*

KURRI-TR-413, 0, p.21 - 27, 1995/00

no abstracts in English

Oral presentation

The Approach to the small animal experiment by new technique in JRR-4

Endo, Kiyoshi*; Nakai, Kei*; Yoshida, Fumiyo*; Shirakawa, Shin*; Yamamoto, Tetsuya*; Matsumura, Akira*; Sawahata, Hiroyuki*; Kawate, Minoru*; Saito, Kimiaki; Kumada, Hiroaki; et al.

no journal, , 

no abstracts in English

Oral presentation

Utilization of advanced radiation facilities under cooperation program with academics

Hirota, Koichi; Sawahata, Hiroyuki*

no journal, , 

Takasaki Advanced Radiation Research Institute has three irradiation facilities of ion-beam, $$gamma$$-ray, and electron-beam aimed at developing cutting-edge technologies for advanced materials, environmental conservation, biotechnology, and medical application. These facilities are available for basic and applied researches by academics, national and local government institutes, and private companies under the cooperation program. For example, the cyclotron is used for researches on radiation-degradation phenomena of semiconductors for space use, controlled polymerization of nanowire, breed improvement etc. The $$gamma$$-ray facilities contribute to diverse research themes and recent noteworthy work is development of radiation-resistant materials for the decommissioning of damaged Fukushima Daiichi Nuclear Power Plant. Users under this cooperation program have advantages of preferential utilization of machine time and utilization fee subsidization. This presentation focuses on the detail of this program with the examples of actual research results.

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