Nobuhito Ishigure
National Institute of Radiological Sciences
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Publication
Featured researches published by Nobuhito Ishigure.
Journal of Nuclear Science and Technology | 1996
Nobuhito Ishigure; Jiro Inaba
A new ICRP human respiratory tract model, Publication 66, consists of a larger number of clearance compartments than the former lung model in Publication 30. The number of the differential equations which express the retention of inhaled materials in the compartments increases from 10 to 27 in the new model. It needs long calculation time to solve numerically the differential equations with a conventional personal computer, because the integral time sometimes reaches 50 years. In the present paper, analytical solutions of the differential equations under instantaneous intake of unit activity are presented so as to calculate rapidly the retention of the deposited activity.
Journal of Nuclear Science and Technology | 1999
Nobuhito Ishigure
For interpretation of the measured data in individual monitoring for internal exposure, information to relate the measurement results with the intake of radionuclides is essential. In 1998, the International Commission on Radiological Protection (ICRP) issued Publication 78 “Individual monitoring for internal exposure of workers. This publication presented the monitoring data of retention and excretion calculated for 29 selected radionuclides (15 elements). However, there are some more radionuclides which are important from the viewpoint of occupational exposure in nuclear industry, research and medicine. In this paper, eight important radionuclides: 32P, 51Cr, 34Mn, 65Zn, 95Zr, 140Ba, 141Ce and “141Ce, were selected and the whole-body content and the daily urinary excretion for them after acute intake by inhalation were calculated, where the new ICRP human respiratory tract model and the new ICRP biokinetic models were applied.
International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements | 1989
Nobuhito Ishigure; Osamu Matsuoka
Abstract It has recently been found that the storage of plastic track detectors in vacuum prior to irradiation decreases the track registration sensitivity. We tested the main gases composing the air: nitrogen, oxygen and water vapour, to assess whether they could recover the sensitivity of the detector once decreased after it had been stored in a vacuum, adopting as intermediate criterion of detector sensitivity the diameters of etch pits left by normally-incident α-particles. The present results demonstrate that oxygen itself is concerned with the vacuum effect on plastic track detectors.
Radiation Protection Dosimetry | 2004
Nobuhito Ishigure; Masaki Matsumoto; Hiroko Enomoto
Journal of Radiation Research | 2001
Nobuhito Ishigure; Akira Endo; Yasuhiro Yamaguchi; Kiyomitsu Kawachi
Journal of Radiation Research | 1994
Yoichi Oghiso; Yuji Yamada; Nobuhito Ishigure; Satoshi Fukuda; Haruzo Iida; Yutaka Yamada; Hiroshi Sato; Akira Koizumi; Jiro Inaba
Journal of Radiation Research | 2001
Yasuyuki Muramatsu; Yutaka Noda; Hidenori Yonehara; Nobuhito Ishigure; Satoshi Yoshida; Masae Yukawa; Keiko Tagami; Tadaaki Ban-Nai; Shigeo Uchida; Toshiyasu Hirama; Makoto Akashi; Yuji Nakamura
Japanese Journal of Health Physics | 1998
Hiroko Enomoto; Nobuhito Ishigure
Journal of Radiation Research | 1994
Nobuhito Ishigure; Hiroko Enomoto; Satoshi Fukuda; Haruzo Iida; Yoichi Oghiso; Hiroshi Sato; Sentaro Takahashi; Yutaka Yamada; Akira Koizumi; Yuji Yamada; Katsuhiro Miyamoto; Jiro Inaba
Japanese Journal of Health Physics | 1992
Nobuhito Ishigure; Hiroko Enomoto; Satoshi Fukuda; Haruzo Iida; Yoichi Oghiso; Yutaka Yamada; Jiro Inaba