Development of a new pinhole camera for imaging in high dose-rate environments

Koki Sueoka, Jun Kataoka, Miho Takabe, Yasuhiro Iwamoto, Makoto Arimoto, Masaki Yoneyama, Isao Yoda, Tatsuo Torii, Yuki Sato, Masaaki Kaburagi, Yuta Terasaka

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    After Fukushima's nuclear disaster in Japan, the decontamination operation is successfully ongoing, and restrictions from some areas were lifted in April 2017. However, the radiation dose rate in the Fukushima Daiichi Plant is still so high (e.g., from a few mSv/h up to 530 Sv/h) that the decommissioning operation of the reactor remains a serious problem. Visualization of radioactive materials would help address this, but no gamma camera is available at this moment that can take images in such a high dose-rate environment. In this study, we developed a new gamma camera featuring a wide dynamic range from sub-mSv/h to more than 680 Sv/h, for a quick and accurate visualization of radioactive materials. The camera consists of a pinhole collimator, a Gd2O2S:Tb (GOS) scintillator sheet, and an electron multiplying charge-coupled device (EM-CCD). Gamma rays passing through the pinhole collimator hit the GOS scintillator sheet, which emits scintillation light. The luminescence of the GOS scintillator sheet is monitored in real-time with an EM-CCD with an internal multiplication gain of up to 20. By changing the exposure time, electron multiplication gain, and aperture of the EM-CCD, a wider dynamic range covering five orders of magnitude in the radiation dose can be monitored for the first time. We show that the positions of a 137Cs source (662 keV) and 60Co source (1173, 1333 keV) are identified correctly with a typical angular resolution of 10° full width at half maximum (FWHM). We also confirmed a linear relation between the absorbed dose and the luminescence of the GOS scintillator sheet. Finally, we propose a new concept of "color imaging", by using multi-layered scintillators consisting of a Ga3Al2Gd3O12 (GAGG) scintillator, fluorescent glass, and a plastic scintillator.

    Fingerprint

    Pinhole cameras
    pinhole cameras
    Phosphors
    scintillation counters
    Imaging techniques
    dosage
    Charge coupled devices
    charge coupled devices
    radioactive materials
    Radioactive materials
    Electrons
    Cameras
    cameras
    pinholes
    collimators
    multiplication
    Dosimetry
    dynamic range
    Luminescence
    electrons

    Keywords

    • Fukushima
    • High dose-rate
    • Pinhole camera

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Instrumentation

    Cite this

    Development of a new pinhole camera for imaging in high dose-rate environments. / Sueoka, Koki; Kataoka, Jun; Takabe, Miho; Iwamoto, Yasuhiro; Arimoto, Makoto; Yoneyama, Masaki; Yoda, Isao; Torii, Tatsuo; Sato, Yuki; Kaburagi, Masaaki; Terasaka, Yuta.

    In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 01.01.2017.

    Research output: Contribution to journalArticle

    Sueoka, Koki ; Kataoka, Jun ; Takabe, Miho ; Iwamoto, Yasuhiro ; Arimoto, Makoto ; Yoneyama, Masaki ; Yoda, Isao ; Torii, Tatsuo ; Sato, Yuki ; Kaburagi, Masaaki ; Terasaka, Yuta. / Development of a new pinhole camera for imaging in high dose-rate environments. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2017.
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    AU - Sueoka, Koki

    AU - Kataoka, Jun

    AU - Takabe, Miho

    AU - Iwamoto, Yasuhiro

    AU - Arimoto, Makoto

    AU - Yoneyama, Masaki

    AU - Yoda, Isao

    AU - Torii, Tatsuo

    AU - Sato, Yuki

    AU - Kaburagi, Masaaki

    AU - Terasaka, Yuta

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