Gamma-ray imaging with a large micro-TPC and a scintillation camera

K. Hattori, S. Kabuki, H. Kubo, S. Kurosawa, K. Miuchi, T. Nagayoshi, H. Nishimura, Y. Okada, R. Orito, H. Sekiya, A. Takada, A. Takeda, T. Tanimori, K. Ueno

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15 Citations (Scopus)


We report on the development of a large Compton camera with the full reconstruction of the Compton process based on a prototype. This camera consists of two kinds of detectors. One is a gaseous time projection chamber (micro-TPC) for measuring the energy and the track of a Compton recoil electron. The micro-TPC is based on a μ-PIC and a GEM, which are micro-pattern gas detectors (MPGDs). The size of the micro-TPC was 10 cm × 10 cm × 8 cm in the case of the prototype, and we enlarged it to 23 cm × 28 cm × 15 cm. The other detector part is a NaI (Tl) Anger camera for measuring the scattered gamma-ray. With these informations, we can completely reconstruct a Compton event, and determine the direction of the incident gamma-ray, event by event. We succeeded in reconstructing events of incident 662 keV gamma-rays. The measured angular resolutions of the "angular resolution measure" (ARM) and the "scatter plane deviation" (SPD) were 9 . 3{ring operator} and 158{ring operator} (FWHM), respectively.

Original languageEnglish
Pages (from-to)517-521
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2 SPEC. ISS.
Publication statusPublished - 2007 Oct 21


  • Compton imaging
  • MeV gamma-ray imaging
  • Time projection chamber


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