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

doi:10.1109/NSSMIC.2016.8069923

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 proceeding › Conference contribution

1 Citation (Scopus)

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 language	English
Title of host publication	2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781509016426
DOIs	https://doi.org/10.1109/NSSMIC.2016.8069923
Publication status	Published - 2017 Oct 16
Event	2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016 - Strasbourg, France Duration: 2016 Oct 29 → 2016 Nov 6

Publication series

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

Other

Other	2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
Country/Territory	France
City	Strasbourg
Period	16/10/29 → 16/11/6

ASJC Scopus subject areas

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

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10.1109/NSSMIC.2016.8069923

Cite this

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 [8069923] (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.. 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 et al.

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

Research output: Chapter in Book/Report/Conference proceeding › Conference 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., 8069923, 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., 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. Institute of Electrical and Electronics Engineers Inc. 2017. 8069923. (2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016). doi: 10.1109/NSSMIC.2016.8069923

Kojima, Keiki ; Nakamori, Takeshi ; Nemoto, Daiki et al. / 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. Institute of Electrical and Electronics Engineers Inc., 2017. (2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016).

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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.",

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

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doi = "10.1109/NSSMIC.2016.8069923",

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AU - Kojima, Keiki

AU - Nakamori, Takeshi

AU - Nemoto, Daiki

AU - Gunji, Shuichi

AU - Sato, Hiroki

AU - Ito, Shigeki

AU - Kato, Sho

AU - Yoshino, Masao

AU - Usuki, Yoshiyuki

AU - Kataoka, Jun

PY - 2017/10/16

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N2 - 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.

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

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