| Project/Area Number |
15560267
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
SHIMOZUMA Mitsuo Hokkaido University, School of Medicine, Professor, 医学部, 教授 (70041960)
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| Co-Investigator(Kenkyū-buntansha) |
DATE Hiroyuki Hokkaido University, School of Medicine, Professor, 医学部, 教授 (10197600)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2003: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Small size Radiation Detector / TiO_2 / Ceramics Structure / SiC / Alumina Structure / Thin Film Radiation Detector / Plasma CVD / Plasma Processing / 放射線センサー / 薄膜センサー / TiO_2薄膜 / プラズマCVD / TiO_2膜 / 紫外線センサー / 生体適用放射線センサー |
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| Research Abstract |
The TiO_2 film have been deposited on alumina substrate by the 50Hz plasma-enhanced CVD at 600℃ using TiCl_4+O_2 gas mixture with a substrate bias circuit using two diodes. Substrate bias voltage was -50(V), and the gas mixture ratio (TiO_2/O_2) was 0.05. The refractive index, dielectric constant and optical energy gap were about 2.7, 120 and 3.0, respectively.
Thin film Radiation detector was made by TiO_2/alumina structure. TiO_2 on alumina plate (1mm in thickness) was deposited 100(nm) to 1(μm) in thickness by the plasma CVD. It seems that thickness of TiO_2 influence upon detector S/N characters. Detector dark current at TiO_2 thickness 200(nm) of TiO_2/alumina structure by 10(V) applied voltage was few tens pA, 1(μm) thickness TiO_2/alumina was few nA current. Therefore, I think so that the thickness of TiO_2 is better than less about 100(nm). Gold thin film two electrodes were set on TiO_2/alumina structure, and add 1 to 100(V) between two electrodes. The film detector was irradiated γ-ray and X-ray of exposure rate 2〜8(C/kg/min) and 5〜33×10^<-4>(C/kg/min), respectively. Irradiation current of I=5 (pA) to 300(pA) was measured with an electrometer at applied voltage 10(V). The measured irradiation current has linearity against radiation intensity. And detection sensitivity of radiation was about 60(nA/ (C/kg/min)). Accordingly, it appears that the thin film radiation detector of TiO_2/alumina structure can be measuring intensity of γ-ray and X-ray. Moreover, the detector was made possible small size as 5×5×1(mm). Moreover, SiC/alumina structure has lower dark current than that of TiO_2/alumina structure. Therefore, it seems that SiC/alumina structure was good detector in comparison with TiO_2/alumina structure.
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