Performance of the gamma-ray camera based on GSO(Ce) scintillator array and PSPMT with the ASIC readout system

Kazuki Ueno, Kaori Hattori, Chihiro Ida, Satoru Iwaki, Shigeto Kabuki, Hidetoshi Kubo, Shunsuke Kurosawa, Kentaro Miuchi, Tsutomu Nagayoshi, Hironobu Nishimura, Reiko Orito, Atsushi Takada, Toru Tanimori

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We have studied the performance of a readout system with ASIC chips for a gamma-ray camera based on a 64-channel multi-anode PSPMT (Hamamatsu flat-panel H8500) coupled to a GSO(Ce) scintillator array. The GSO array consists of 8×8 pixels of 6×6×13 mm3 with the same pixel pitch as the anode of the H8500. This camera is intended to serve as an absorber of an electron tracking Compton gamma-ray camera that measures gamma rays up to ∼1 MeV. Because we need a readout system with low power consumption for a balloon-borne experiment, we adopted a 32-channel ASIC chip, IDEAS VA32_HDR11, which has one of the widest dynamic range among commercial chips. However, in the case of using a GSO(Ce) crystal and the H8500, the dynamic range of VA32_HDR11 is narrow, and therefore the H8500 has to be operated with a low gain of about 105. If the H8500 is operated with a low gain, the camera has a narrow incident-energy dynamic range from 100 to 700 keV, and a bad energy resolution of 13.0% (FWHM) at 662 keV. We have therefore developed an attenuator board in order to operate the H8500 with the typical gain of 106, which can measure up to ∼1 MeV gamma ray. The board makes the variation of the anode gain uniform and widens the dynamic range of the H8500. The system using the new attenuator board has a good uniformity of min:max∼1:1.6, an incident-energy dynamic range from 30 to 900 keV, a position resolution of less than 6 mm, and a typical energy resolution of 10.6% (FWHM) at 662 keV with a low power consumption of about 1.7 W/64ch. Crown

Original languageEnglish
Pages (from-to)268-271
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume591
Issue number1
DOIs
Publication statusPublished - 2008 Jun 11
Externally publishedYes

Keywords

  • ASIC
  • Gamma-ray camera
  • PSPMT
  • Scintillator

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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