Spectroscopic performance of pixellated thallium bromide detectors

Toshiyuki Onodera, Keitaro Hitomi, Tadayoshi Shoji, Yukio Hiratate, Hiroshi Kitaguchi

Research output: Contribution to journalConference articlepeer-review


Pixellated TlBr detectors have been fabricated from TlBr crystals grown by the traveling molten zone (TMZ) method with zone-refined materials. Charge transport properties of the crystals were measured by performing the Hecht analysis. The TlBr crystals have exhibited the mobility-lifetime product of around 10 -3 cm 2 /V for electrons, which is three times larger than the previously reported value. The pixellated TlBr detectors have thicknesses of ∼2 mm and 4 pixellated electrodes (0.57 mm × 0.57 mm each) on the anode surface. In order to evaluate the spectroscopic performance, the detectors have been tested with 57 Co, 137 Cs and 60 Co gamma-ray sources at room temperature. The TlBr detector 1.9 mm thick has demonstrated energy resolutions of 5.5% (6.7 keV) and 3.4% (22.3 keV) for 122 and 662 keV gamma-rays, respectively. Full-energy peaks of 1.17 and 1.33 MeV gamma-rays from the 60 Co source have also been detected with the detector.

Original languageEnglish
Pages (from-to)4448-4450
Number of pages3
JournalIEEE Nuclear Science Symposium Conference Record
Publication statusPublished - 2004 Dec 1
Event2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors - Rome, Italy
Duration: 2004 Oct 162004 Oct 22

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging


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