| Project/Area Number |
16360042
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Japan Synchrotron Radiation Research Institute |
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Principal Investigator |
TOYOKAWA Hidenori Japan Synchrotron Radiation Research Institute, Beamline Division, Senior Scientist, ビームライン・技術部門 検出器チーム, チームリーダー 主幹研究員 (60344397)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Masayo Japan Synchrotron Radiation Research Institute, Beamline Division, Associate Chief Scientist, ビームライン・技術部門 検出器チーム, 副主席研究員 (80360840)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥13,300,000 (Direct Cost: ¥13,300,000)
Fiscal Year 2005: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2004: ¥9,300,000 (Direct Cost: ¥9,300,000)
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| Keywords | Ionization radiation detector / Semiconductor detector / Germanium detector / Pixel detector |
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| Research Abstract |
Germanium detectors are widely in use for detecting high energy X-ray photons, both because of the high energy resolution and because of high detection efficiency. However, it is a disadvantage in practice that Germanium detectors have to be operated at liquid nitrogen temperature due to the low characteristic energy (0.67 eV). It is well known that the dark current drawing in a given Germanium detector consists of the bulk current and the surface leakage one. The number of density of electron-hole pairs generated by ionizing particles is, on the other hand, independent from the detection volume, increases with the energy of ionization particles, and localized within a few hundreds μm. With an electrode as small as the pixel size assumed in the present work (100 μm×100 μm), furthermore, the noise current should be reduced less than 100 nA per pixel, since it is proportional to the volume of the semiconductor each pixel electrode covers.
We have confirmed that the noise current is already reduced to 10 μA at room temperature in a tiny germanium detector with a volume of 1 mm×1 mm×1 mm. In this study, we have investigated a pixilated Germanium sensor with 60×97 pixels of size 172 μm×172 μm. The result was talked as the title "Pixilation Effect on Germanium Detectors and Their Temperature Dependencies" in the IEEE conference : the Nuclear Science & Symposium & Medical Imaging Conference, Puerto Rico, October 23-29,2005.
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