"stereo Compton cameras" for the 3-D localization of radioisotopes

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

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    The Compton camera is a viable and convenient tool used to visualize the distribution of radioactive isotopes that emit gamma rays. After the nuclear disaster in Fukushima in 2011, there is a particularly urgent need to develop "gamma cameras", which can visualize the distribution of such radioisotopes. In response, we propose a portable Compton camera, which comprises 3-D position-sensitive GAGG scintillators coupled with thin monolithic MPPC arrays. The pulse-height ratio of two MPPC-arrays allocated at both ends of the scintillator block determines the depth of interaction (DOI), which dramatically improves the position resolution of the scintillation detectors. We report on the detailed optimization of the detector design, based on Geant4 simulation. The results indicate that detection efficiency reaches up to 0.54%, or more than 10 times that of other cameras being tested in Fukushima, along with a moderate angular resolution of 8.1° (FWHM). By applying the triangular surveying method, we also propose a new concept for the stereo measurement of gamma rays by using two Compton cameras, thus enabling the 3-D positional measurement of radioactive isotopes for the first time. From one point source simulation data, we ensured that the source position and the distance to the same could be determined typically to within 2 meters' accuracy and we also confirmed that more than two sources are clearly separated by the event selection from two point sources of simulation data.

    Original languageEnglish
    Pages (from-to)187-191
    Number of pages5
    JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Volume765
    DOIs
    Publication statusPublished - 2014 Nov 21

    Fingerprint

    Radioisotopes
    Cameras
    cameras
    data simulation
    Gamma rays
    Phosphors
    radioactive isotopes
    point sources
    scintillation counters
    gamma rays
    Scintillation counters
    disasters
    detectors
    Surveying
    pulse amplitude
    Full width at half maximum
    angular resolution
    Disasters
    scintillation
    Detectors

    Keywords

    • Compton camera
    • DOI
    • Geant4
    • Stereo measurement

    ASJC Scopus subject areas

    • Instrumentation
    • Nuclear and High Energy Physics

    Cite this

    "stereo Compton cameras" for the 3-D localization of radioisotopes. / Takeuchi, K.; Kataoka, Jun; Nishiyama, T.; Fujita, T.; Kishimoto, A.; Ohsuka, S.; Nakamura, S.; Adachi, S.; Hirayanagi, M.; Uchiyama, T.; Ishikawa, Y.; Kato, T.

    In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 765, 21.11.2014, p. 187-191.

    Research output: Contribution to journalArticle

    Takeuchi, K, Kataoka, J, Nishiyama, T, Fujita, T, Kishimoto, A, Ohsuka, S, Nakamura, S, Adachi, S, Hirayanagi, M, Uchiyama, T, Ishikawa, Y & Kato, T 2014, '"stereo Compton cameras" for the 3-D localization of radioisotopes', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 765, pp. 187-191. https://doi.org/10.1016/j.nima.2014.04.039
    Takeuchi, K. ; Kataoka, Jun ; Nishiyama, T. ; Fujita, T. ; Kishimoto, A. ; Ohsuka, S. ; Nakamura, S. ; Adachi, S. ; Hirayanagi, M. ; Uchiyama, T. ; Ishikawa, Y. ; Kato, T. / "stereo Compton cameras" for the 3-D localization of radioisotopes. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2014 ; Vol. 765. pp. 187-191.
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