| Project/Area Number |
07558186
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
エネルギー学一般・原子力学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KOBAYASHI Tooru Kyto University, Research Reactor Institute, Associate Professor, 原子炉実験所, 助教授 (90089136)
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| Co-Investigator(Kenkyū-buntansha) |
OZAKI Tutomu Japan Energy Co.Ltd., Technical Research Laboratory, Chief Researcher, 研究開発本部, 技師長
YOSHITANI Masao Toyo Medic Co.Ltd., Technical Research Laboratory, Director, 技術研究所, 所長
SAKURAI Yoshinori Kyoto University, Research Reactor Institute, Research Associate, 原子炉実験所, 助手 (20273534)
ONO Koichi Kyoto University, Research Reactor Institute, Research Associate, 原子炉実験所, 助手 (20027452)
小野塚 新 (株)ジャパンエナジー, 研究開発本部, 技術長
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1997: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1996: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Keywords | Neutron Capture Therapy / On-line Measurement / SPECT / Prompt Gamma-ray measuement / CdTe Semiconductor / Heavy Water Facility / Lithium Neutron Shielding / 中性子捕捉療法 / 半導体検出器 / 生体内照射線量分布 / 同時測定法 / 検出素子 / 即発γ線スペクトル / CdTe(カドミウム-テルル) |
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| Research Abstract |
The purpose of this research is to clarify the feasibility of single photon emission computed tomography system with prompt gamma analysis (named PG-SPECT system), which is expected as an effective real-time measurement method for dose distribution in a living body. We put emphasis on the optimization of the detector material and its size, and the improvement in the system maintenance, such as disuse of the cooling with liquid nitrogen etc., which is usually indispensable to semiconductor detector.
In 1995 (Heisei 7), the applicability of Ge semiconductor detector and CdTe semiconductor detector to the PG-SPECT system were studied. Especially, the CdTe detector is thought to be an adequate detector for this system, because of its possibilities of downsizing and disuse of the cooling by the recent remarkable innovation.
In 1996 (Heisei 8), the characteristics of CdTe detector at room temperature was estimated, and the effectiveness of the simple cooling method applying Peltier effect was researched by experiments and simulation calculation. It was confirmed that the CdTe detector with the Peltier cooling had great potentialities. Moreover, shielding sheets for thermal neutrons were made using polyethylene mixed with 6LiF,which purchased in 1995, at 30 weight percent, and its effectiveness was confirmed from experiments.
In 1997 (Heisei 9), the characteristics evaluation of Ge detector and CdTe detector was continued by experiments and simulation calculations. Furthermore, (1) the reduction of statistical error at low-counts and (2) the collimation system for small-size detector at mixed field of neutrons and gamma-rays were examined. From those results, some research subjects are newly extracted for the next steps.
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