Large-volume thallium bromide detectors for gamma-ray spectroscopy

K. Hitomi, O. Muroi, M. Matsumoto, T. Shoji, Y. Hiratate

Research output: Contribution to journalConference articlepeer-review

11 Citations (Scopus)


Thallium bromide (TlBr) is a wide-bandgap compound semiconductor characterized with high photon stopping power. In this study, large-volume γ-ray detectors (approximately 3.8 × 3.8 × 3.8 mm3) have been fabricated from TlBr crystals grown by the horizontal travelling molten zone (TMZ) method using zone-purified material. In order to extract the energy information of the incident radiation from the thick detectors, the short charge-collection time technique has been applied to the detectors. By this technique, the induced charge on the electrode is measured for a period of time that is short compared to the carrier transit time in order to minimize the deviation of the measured induced charge. The large-volume TlBr detectors irradiated with 22Na and 137Cs γ-ray sources at room temperature have exhibited energy resolutions of 18.7% and 17.4% (FWHM) for the 511- and 662-keV peaks, respectively. To our knowledge, this is the first time that full-energy peaks have been obtained from TlBr detectors several millimeters thick. The time stability of the detector operation is also studied.

Original languageEnglish
Pages (from-to)2313-2316
Number of pages4
JournalIEEE Transactions on Nuclear Science
Issue number6 II
Publication statusPublished - 2001 Dec
Event2001 Nuclear Science Symposium (NSS) - Lyon, France
Duration: 2000 Oct 152000 Oct 20


  • Semiconductor detectors
  • Thallium bromide (TlBr)
  • γ-ray spectroscopy

ASJC Scopus subject areas

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


Dive into the research topics of 'Large-volume thallium bromide detectors for gamma-ray spectroscopy'. Together they form a unique fingerprint.

Cite this