Gamma-Ray Detectors Fabricated From TlBr Crystals(<Special Issue>Single Crystals for Advanced Sensors in the Next Generation)

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  • Hitomi Keitaro
    Cyclotron and Radioisotope Center, Tohoku University
  • Ishii Keizo
    Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University

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Other Title
  • 化合物半導体TlBr結晶を用いたガンマ線検出器(<特集>次世代先進センサーを拓く単結晶材料)
  • 化合物半導体TlBr結晶を用いたガンマ線検出器
  • カゴウブツ ハンドウタイ TlBr ケッショウ オ モチイタ ガンマセン ケンシュツキ

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Description

Thallium bromide (TlBr) is a compound semiconductor attractive for fabrication of gamma-ray detectors. TlBr exhibits very high photon stopping power originating from its high atomic numbers (Ti: 81, Br: 35) and high density (7.56g/cm^3). Capacitive Frisch grid detectors and pixelated detectors were fabricated from TlBr crystals grown by the traveling molten zone method. The capacitive Frisch grid detectors exhibited an energy resolution of 1.7% FWHM for 662keV gamma-rays at -20℃. An energy resolution of 1.2% FWHM for 662keV was obtained from a pixelated anode of a TlBr detector operating at room temperature.

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