Radiation detector made of a high-quality polycrystalline diamond |
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| Authors: | JH Kaneko T Tanaka S Kawamura Y Oshiki K Tsuji M Katagiri K Ochiai T Nishitani F Fujita A Homma T Sawamura T Iida M Furusaka |
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| Affiliation: | aHokkaido University, N13 W8, Kitaku, Sapporo 060-8628, Japan;bNational Institute for Fusion Science, Oroshi-cho, Toki, Gifu 509-5292, Japan;cJapan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan;dOsaka University, Yamadaoka, Suita, Osaka 565-0871, Japan |
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| Abstract: | Radiation detector was made of a high-quality CVD polycrystalline diamond composed of frost column like structure diamond grains, and induced charge distribution spectra and drift velocities were measured by using alpha particles. As a result, the CVD polycrystalline achieved maximum induced charge of 83% of HP/HT type IIa diamond. Moreover, the CVD crystal had lower charge loss on electrons compared with the HP/HT type IIa diamond. Drift velocities of electrons and holes were ve = 7.7 × 104 and vh = 7.3 × 104cm/s at an electric field of 20 kV/cm, respectively. In addition, response function measurement for 14 MeV neutrons was carried out. |
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