Timing performance of TlBr detectors

Keitaro Hitomi, Tsutomu Tada, Toshiyuki Onodera, Tadayoshi Shoji, Seong Yun Kim, Yuanlai Xu, Keizo Ishii

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The timing performance of TlBr detectors was evaluated at room temperature (22°C). 0.5-mm-thick planar TlBr detectors with Tl circular electrodes with a diameter of 3 mm were fabricated from TlBr crystals grown by the traveling molten zone method using a zone-purified material. The pulse rise time of the TlBr detector was measured using a digital oscilloscope as the cathode surface of the device was irradiated with a 22Na gamma-ray source. Coincidence timing spectra were obtained between the TlBr detector and a BaF2 scintillation detector when both detectors were irradiated with 511 keV positron annihilation gamma-rays. The timing resolution of the TlBr detector was found to be inversely proportional to the applied bias voltage. The TlBr detector, in coincidence with the BaF2 detector, exhibited timing resolutions characterized by a 6.5 ns full width at half maximum (FWHM) and an 8.5 ns FWHM with and without an energy window of 350 keV-560 keV, respectively.

Original languageEnglish
Article number6555936
Pages (from-to)2883-2887
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number4
Publication statusPublished - 2013


  • Positron emission tomography
  • semiconductor radiation detector
  • thallium bromide
  • timing resolution


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