Handy Compton camera using 3D position-sensitive scintillators coupled with large-area monolithic MPPC arrays

Jun Kataoka, A. Kishimoto, T. Nishiyama, T. Fujita, K. Takeuchi, T. Kato, T. Nakamori, S. Ohsuka, S. Nakamura, M. Hirayanagi, S. Adachi, T. Uchiyama, K. Yamamoto

    Research output: Contribution to journalArticle

    64 Citations (Scopus)

    Abstract

    The release of radioactive isotopes (mainly 137Cs, 134Cs and 131I) from the crippled Fukushima Daiichi Nuclear Plant remains a serious problem in Japan. To help identify radiation hotspots and ensure effective decontamination operation, we are developing a novel Compton camera weighting only 1 kg and measuring just ∼10 cm2 in size. Despite its compactness, the camera realizes a wide 180 field of vision with a sensitivity about 50 times superior to other cameras being tested in Fukushima. We expect that a hotspot producing a 5μSv/h dose at a distance of 3 m can be imaged every 10 s, with angular resolution better than 10 (FWHM). The 3D position-sensitive scintillators and thin monolithic MPPC arrays are the key technologies developed here. By measuring the pulse-height ratio of MPPC-arrays coupled at both ends of a Ce:GAGG scintillator block, the depth of interaction (DOI) is obtained for incident gamma rays as well as the usual 2D positions, with accuracy better than 2 mm. By using two identical 10 mm cubic Ce:GAGG scintillators as a scatterer and an absorber, we confirmed that the 3D configuration works well as a high-resolution gamma camera, and also works as spectrometer achieving typical energy resolution of 9.8% (FWHM) for 662 keV gamma rays. We present the current status of the prototype camera (weighting 1.5 kg and measuring 8.5×14×16 cm3 in size) being fabricated by Hamamatsu Photonics K.K. Although the camera still operates in non-DOI mode, angular resolution as high as 14 (FWHM) was achieved with an integration time of 30 s for the assumed hotspot described above.

    Original languageEnglish
    Pages (from-to)403-407
    Number of pages5
    JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Volume732
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    Phosphors
    scintillation counters
    Cameras
    cameras
    Full width at half maximum
    angular resolution
    Gamma rays
    gamma rays
    decontamination
    Decontamination
    void ratio
    pulse amplitude
    Radioisotopes
    radioactive isotopes
    Photonics
    Spectrometers
    Japan
    absorbers
    prototypes
    interactions

    Keywords

    • Compton camera
    • Gamma rays
    • Multi-Pixel Photon Counter (MPPC)

    ASJC Scopus subject areas

    • Instrumentation
    • Nuclear and High Energy Physics

    Cite this

    Handy Compton camera using 3D position-sensitive scintillators coupled with large-area monolithic MPPC arrays. / Kataoka, Jun; Kishimoto, A.; Nishiyama, T.; Fujita, T.; Takeuchi, K.; Kato, T.; Nakamori, T.; Ohsuka, S.; Nakamura, S.; Hirayanagi, M.; Adachi, S.; Uchiyama, T.; Yamamoto, K.

    In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 732, 2013, p. 403-407.

    Research output: Contribution to journalArticle

    Kataoka, Jun ; Kishimoto, A. ; Nishiyama, T. ; Fujita, T. ; Takeuchi, K. ; Kato, T. ; Nakamori, T. ; Ohsuka, S. ; Nakamura, S. ; Hirayanagi, M. ; Adachi, S. ; Uchiyama, T. ; Yamamoto, K. / Handy Compton camera using 3D position-sensitive scintillators coupled with large-area monolithic MPPC arrays. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2013 ; Vol. 732. pp. 403-407.
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    AU - Kishimoto, A.

    AU - Nishiyama, T.

    AU - Fujita, T.

    AU - Takeuchi, K.

    AU - Kato, T.

    AU - Nakamori, T.

    AU - Ohsuka, S.

    AU - Nakamura, S.

    AU - Hirayanagi, M.

    AU - Adachi, S.

    AU - Uchiyama, T.

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