Performance of 8 × 8 pixel LaBr3: Ce and Gd 2SiO5: Ce scintillator arrays coupled to a 64-channel multi-anode PMT

Shunsuke Kurosawa, Hidetoshi Kubo, Kaori Hattori, Chihiro Ida, Satoru Iwaki, Shigeto Kabuki, Kentaro Miuchi, Hironobu Nishimura, Yoko Okada, Joseph D. Parker, Atsushi Takada, Michiaki Takahashi, Toru Tanimori, Kazuki Ueno, Yoshio Yanagida

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We have developed a LaBr3 :Ce scintillator array consisting of 8 × 8 pixels with a size of 5.8 mm × 5.8 mm × 15.0 mm, which serves as an absorber of scattered gamma rays with energies from 0.1 to 1 MeV in a Compton camera. The pixels were cut from two pieces of LaBr3 :Ce crystal with a diameter of 38 mm and a length of 38 mm with full width at half-maximum (FWHM) energy resolutions of 4.1 ± 0.1 % and 3.0 ± 0.1 % at 356 and 662 keV, respectively, measured with a single anode photomultiplier tube (PMT). The crystal had the following volumetric uniformities: light outputs with a difference of 0.5% (standard deviation: SD) and energy resolutions with that of 2% (SD) at 356 keV. In contrast, for each pixel in the array, the average and SD FWHM energy resolutions over 64 pixels, measured with a single-anode PMT and a collimator, were 5.8 ± 0.9% at 356 keV. The array was then coupled to a 64-channel multi-anode PMT (Hamamatsu H8500), the anode pitch of which was the same as the LaBr :Ce pixel pitch of 6.1 mm. When the 64 anodes were read out from four channels in a resistor chain by the charge division method, the FWHM energy resolution of all 64 pixels was 7.0 ± 0.5 % at 662 keV, whereas that of the inner6 × 6 pixels was 5.8±0.4% at 662 keV. In addition, we measured a Gd2SiO 5 :Ce (GSO:Ce) scintillator array consisting of 8×8 pixels with a size of 5.9 mm × 5.9 mm × 13.0 mm to compare its performance with that of the LaBr3 :Ce array. The FWHM energy resolution of all 64 GSO:Ce pixels was 10.8 ± 0.3% at 662 keV. With these energy resolutions, FWHM angular resolutions of the Compton camera using the LaBr3 :Ce and GSO:Ce arrays are expected to be 4.6° and 5.3°, respectively, at 662 keV.

Original languageEnglish
Article number5341429
Pages (from-to)3779-3788
Number of pages10
JournalIEEE Transactions on Nuclear Science
Volume56
Issue number6
DOIs
Publication statusPublished - 2009 Dec
Externally publishedYes

Keywords

  • Array camera
  • Compton camera
  • GSO:Ce
  • LaBr:Ce
  • Scintillation detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

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