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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    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.

    Original languageEnglish
    Title of host publication2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Volume2017-January
    ISBN (Electronic)9781509016426
    DOIs
    Publication statusPublished - 2017 Oct 16
    Event2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016 - Strasbourg, France
    Duration: 2016 Oct 292016 Nov 6

    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

    Fingerprint

    Gamma Rays
    Gamma rays
    Phosphors
    scintillation counters
    gamma rays
    Detectors
    detectors
    angular resolution
    radiation sources
    Radiation
    Lead
    Direction compound
    1-myristoyl-2-palmitoyl-sn-glycero-3-phosphocholine
    simulation
    Experiments

    ASJC Scopus subject areas

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

    Cite this

    Kojima, K., Nakamori, T., Nemoto, D., Gunji, S., Sato, H., Ito, S., ... Kataoka, J. (2017). Development of gamma-ray detector sensitive to source directions using GAGG(Ce) scintillators and MPPCs. In 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016 (Vol. 2017-January). [8069923] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/NSSMIC.2016.8069923

    Development of gamma-ray detector sensitive to source directions using GAGG(Ce) scintillators and MPPCs. / Kojima, Keiki; Nakamori, Takeshi; Nemoto, Daiki; Gunji, Shuichi; Sato, Hiroki; Ito, Shigeki; Kato, Sho; Yoshino, Masao; Usuki, Yoshiyuki; Kataoka, Jun.

    2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016. Vol. 2017-January Institute of Electrical and Electronics Engineers Inc., 2017. 8069923.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Kojima, K, Nakamori, T, Nemoto, D, Gunji, S, Sato, H, Ito, S, Kato, S, Yoshino, M, Usuki, Y & Kataoka, J 2017, Development of gamma-ray detector sensitive to source directions using GAGG(Ce) scintillators and MPPCs. in 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016. vol. 2017-January, 8069923, Institute of Electrical and Electronics Engineers Inc., 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016, Strasbourg, France, 16/10/29. https://doi.org/10.1109/NSSMIC.2016.8069923
    Kojima K, Nakamori T, Nemoto D, Gunji S, Sato H, Ito S et al. Development of gamma-ray detector sensitive to source directions using GAGG(Ce) scintillators and MPPCs. In 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016. Vol. 2017-January. Institute of Electrical and Electronics Engineers Inc. 2017. 8069923 https://doi.org/10.1109/NSSMIC.2016.8069923
    Kojima, Keiki ; Nakamori, Takeshi ; Nemoto, Daiki ; Gunji, Shuichi ; Sato, Hiroki ; Ito, Shigeki ; Kato, Sho ; Yoshino, Masao ; Usuki, Yoshiyuki ; Kataoka, Jun. / Development of gamma-ray detector sensitive to source directions using GAGG(Ce) scintillators and MPPCs. 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016. Vol. 2017-January Institute of Electrical and Electronics Engineers Inc., 2017.
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    abstract = "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.",
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    AU - Nemoto, Daiki

    AU - Gunji, Shuichi

    AU - Sato, Hiroki

    AU - Ito, Shigeki

    AU - Kato, Sho

    AU - Yoshino, Masao

    AU - Usuki, Yoshiyuki

    AU - Kataoka, Jun

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