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Dive into the research topics where Satoru Hatakeyama is active.

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Featured researches published by Satoru Hatakeyama.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1989

Low-energy nuclear radiation detection with a silicon photodiode

Hisao Yamamoto; Satoru Hatakeyama; Toshiyuki Norimura; Takehiko Tsuchiya

Abstract A radiation detector was fabricated from a commercial silicon photodiode, after removing its transparent cover cap and surface coating. The window thickness of the detector fabricated was evaluated to be 23 μg/cm2. The area of the depletion region was 13.2 mm2 and its depth was estimated to be about 100 μm. The energy resolution (FWHM) was 2.0 keV for conversion electrons (62.52 and 84.23 keV) from 109Cd and 1.8 keV for γ-rays (26.34 and 59.54 keV) from 241Am at room temperature. The lowest limit of measurable energy was about 5 keV for photons and 6 keV for electrons.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1991

Anisotropie β-ray emission from a standard source due to self-absorption

Hisao Yamamoto; Satoru Hatakeyama; Toshiyuki Norimura; Takehiko Tsuchiya; Akira Katase

Abstract Assuming that β-rays are emitted isotropically from a 14C standard source, the detection efficiency of a semiconductor detector has been found to be above 100%. Such an unreasonable value is shown to be induced by the anisotropy of the β-ray emission from the standard source. The anisotropy is ascribed to the difference in the absorption of β-rays in the source depending on the angle of emission. The effect of anisotropy on the counting efficiency is evaluated and a correction method for its effect is described.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1996

Improvement on experimental procedure of various samples in PIXE analysis

S. Futatsugawa; Satoru Hatakeyama; Y. Saitou; K. Sera

Abstract Standard experimental procedures of PIXE in NMCC are described. We are engaged in researches on PIXE analysis and PET study by use of a small cyclotron in collaboration with CRC. The facilities are opened to scientists in Japan. As the research fields of the scientists are very wide, many kinds of samples are analyzed by PIXE. We established standard experimental procedures for those various samples. Preparation of the samples must be easy and simple to minimize risks of contamination and nonuniformity. We usually use silver nitrate or indium salt as an internal standard. Specific absorbers are often used to attenuate X-rays from a major matrix in specific samples.


Journal of Nuclear Science and Technology | 2012

Remote calibration of ionization chambers for radioactivity calibration

Yasushi Sato; Takahiro Yamada; Toshikazu Suzuki; Chie Toramatsu; Akira Yunoki; Yoshio Hino; Hideki Harano; Tetsuro Matsumoto; Tetsuya Shimoyama; Tadahiro Kurosawa; Masahiro Kato; Katsuhisa Kudo; Mikio Matsumoto; Kenji Suzuki; Satoru Hatakeyama; Kouichi Doi; Yoshihiro Saito; Kazutoshi Suzuki; Toshimitsu Fukumura; Katsuhiro Miyamoto; Akinori Iwamoto; Kenichi Endo; Shohei Matsubara

A new calibration technique, referred to as e-trace, has been developed by the National Institute of Advanced Industrial Science and Technology (AIST). The e-trace technique enables rapid remote calibration of measurement equipment and requires minimal resources. We calibrated radioisotope calibrators of the Japan Radioisotope Association (JRIA) and the Nishina Memorial Cyclotron Center (NMCC) remotely and confirmed that remote calibration provided results that are consistent with the results obtained by existing methods within the limits of uncertainty. Accordingly, e-trace has been approved as the standard calibration method at AIST. We intend to apply remote calibration to radioisotope calibrators in hospitals and isotope facilities.


Archive | 2007

The remote calibration of radioisotope calibrators

Yasushi Sato; Akira Yunoki; Yoshio Hino; Tadahiro Kurosawa; Masahiro Kato; Hideki Harano; Tetsuro Matsumoto; Tetsuya Shimoyama; Katsuhisa Kudo; Takahiro Yamada; Mikio Matsumoto; Kenji Suzuki; Satoru Hatakeyama; Kouichi Doi; Yoshihiro Saito; Toshikazu Suzuki; Kazutoshi Suzuki; Toshimitsu Fukumura; Katsuhiro Miyamoto; Chie Toramatsu; Akinori Iwamoto; Kenichi Endou; Shouhei Matsubara

the new calibration technique ‘e-trace’ has been developed by AIST. Using e-trace, measurement equipment in remote place can be calibrated in short time and limited resources. We calibrated radioisotope calibrators of JRIA and NMCC remotely. It was confirmed that the results of remote calibration was consistent with those of former method within uncertainty. As a result, e-trace is approved as a regular calibration method at AIST. We plan to apply remote calibration to the calibration of the radioisotope calibrators in hospitals and isotope facilities.


Radioisotopes | 1984

A radiation detector fabricated from silicon photodiode.

Hisao Yamamoto; Satoru Hatakeyama; Toshiyuki Norimura; Takehiko Tsuchiya


Journal of UOEH | 1989

Long-Term Tissue Distribution and Steady State Activity Ratios of 232Th and Its Daughters in Rats after lntravascular Injection of Thorotrast

Toshiyuki Norimura; Takehiko Tsuchiya; Satoru Hatakeyama; Hisao Yamamoto; Shunzo Okajima


Journal of UOEH | 1988

Estimation of absorbed dose of beta radiation into the critical tissues by a single injection of tritiated water

Takehiko Tsuchiya; Toshiyuki Norimura; Hisao Yamamoto; Satoru Hatakeyama; Seitaro Dohi; Naoki Kunugita


Journal of Radiation Research | 1988

The Effects of Tritiated Water on the Bone Marrow Cells in Mice

Takehiko Tsuchiya; Toshiyuki Norimura; Miyuki Nikaido; Hiroyo Kakihara; Hisao Yamamoto; Satoru Hatakeyama


Radioisotopes | 1992

Outline of Medical Cyclotron Center. Facility and radiation level.

Syoji Futatsukawa; Satoru Hatakeyama; Yasuko Kaneko; Yoshihiro Saito; Kouichiro Sera; Kentaro Hatano; Toshiaki Sasaki

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Takehiko Tsuchiya

University of Occupational and Environmental Health Japan

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Toshiyuki Norimura

University of Occupational and Environmental Health Japan

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Akira Yunoki

National Institute of Advanced Industrial Science and Technology

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Chie Toramatsu

National Institute of Radiological Sciences

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Hideki Harano

National Institute of Advanced Industrial Science and Technology

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Katsuhiro Miyamoto

National Institute of Radiological Sciences

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Katsuhisa Kudo

National Institute of Advanced Industrial Science and Technology

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Kazutoshi Suzuki

National Institute of Radiological Sciences

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Kentaro Hatano

Iwate Medical University

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