Development of Compton camera using CdTe strip detector
| Project/Area Number |
17540273
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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 |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Osaka University |
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Principal Investigator |
ODAHARA Atsuko Osaka University, Graduate School of Science, associate professor (30264013)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUCHI Tomonori Osaka University, Graduate School of Science, Research Associate (40376546)
MOTOMURA Shinji RIKEN, Accelerator Applications Research Division, special postdoctoral researcher (20360654)
SHIMODA Tadashi Osaka University, Graduate School of Science, professor (70135656)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,720,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥120,000)
Fiscal Year 2007: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | experimental nuclear physics / radiation. X ray particle beam / CdTe detector / Compton camera / position detection of γ-ray source |
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| Research Abstract |
We designed Compton camera using CdTe detector. Compton camera is a device to obtain images of γ-ray sources by tracking Compton scattering in materials of detectors. This device is expected to be applied to several fields of nuclear physics, medicine, industry, biology and so on.
We made a double sided CdTe strip detector, which is of Ohmic type with 20x 20x 5t mm and 10 strips on each side, as a prototype detector for Compton camera. Although CdTe detector has many good points such as high efficiency and so on, energy resolution and photo peak efficiency of thick crystal are worse, because mobility lifetime product is small and especially that for holes is much worse than that for electrons. Charge collection depends on interaction points of γ-rays in the crystal. In order to improve photo peak efficiency and energy resolution, shape analysis for output signals of pre-amplifier was carried out using a CdTe detector with 3 mm width. Pulse shapes were also simulated by Geant4 code. Pulse heights were collected event by event based on the information of depth of interaction points, which were deduced by the rise time of pulse. We succeeded to improve energy resolution to be 4%. Moreover, the best condition for Compton camera was discussed in case of combinations of CdTe, Ge and Si crystals by using Geant4 code.
In order to apply the Compton camera to γ-ray spectroscopy of nuclear physics, experiment was performed using heavy ion beam delivered from AVF cyclotron at RCNP, Osaka University. Gamma rays emitted from nuclei produced by the fusion reaction were measured by 13 Ge detectors. We could reduce the background γ-rays by removing cross talk components between 2 detectors based on the informations of Compton scattering angle and deposited γ-ray energy in Ge detectors.
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Report
(4 results)
Research Products
(8 results)
