Development of gamma-ray detector sensitive to source directions using GAGG(Ce) scintillators and MPPCs

Keiki Kojima, Takeshi Nakamori, Daiki Nemoto, Shuichi Gunji, Hiroki Sato, Shigeki Ito, Sho Kato, Masao Yoshino, Yoshiyuki Usuki, Jun Kataoka

    研究成果: Conference contribution

    抄録

    We have developed a simpler, smaller, and thus less expensive gamma-ray detector that can roughly determine the incident direction of a radiation source with moderate angular resolution, aiming for personal use beyond that afforded by conventional survey meters. The detector consists of six GAGG(Ce) scintillators with dimensions of 20 × 20 × 6 mm3 on each face of a 3-cm cubic lead block. Signals from each scintillator are read by a 3 × 3 mm2 Hamamatsu MPPC. We then applied χ2 fit to the observed count number set in order to determine the incident direction and set our angular accuracy goal of 22.5°. Through simulation, we injected 662 keV gamma rays uniformly from in front of the detector. We found that the R90 is distributed from 6.0° to 18.3° in all 980 directions for one-minute exposure to a 137Cs source that gives 0.15 μSv/h. Furthermore, our detector achieved the targeted value under BG intensity of 0.25 μSv/h in the experiment.

    本文言語English
    ホスト出版物のタイトル2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
    出版社Institute of Electrical and Electronics Engineers Inc.
    ISBN(電子版)9781509016426
    DOI
    出版ステータスPublished - 2017 10 16
    イベント2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016 - Strasbourg, France
    継続期間: 2016 10 292016 11 6

    出版物シリーズ

    名前2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
    2017-January

    Other

    Other2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
    CountryFrance
    CityStrasbourg
    Period16/10/2916/11/6

    ASJC Scopus subject areas

    • Radiology Nuclear Medicine and imaging
    • Instrumentation
    • Nuclear and High Energy Physics
    • Electronic, Optical and Magnetic Materials

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