Room temperature X- and gamma-ray detectors using thallium bromide crystals

Details Room temperature X- and gamma-ray detectors using thallium bromide crystals Room temperature X- and gamma-ray detectors using thallium bromide crystals

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nimpa.436..160h&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 436, Issue 1-2, p. 160-164.

Physics

7

Scientific paper

Thallium bromide (TlBr) is a compound semiconductor with wide band gap (2.68eV) and high X- and γ-ray stopping power. The TlBr crystals were grown by the horizontal travelling molten zone (TMZ) method using purified material. Two types of room temperature X- and γ-ray detectors were fabricated from the TlBr crystals: TlBr detectors with high detection efficiency for positron annihilation γ-ray (511keV) detection and TlBr detectors with high-energy resolution for low-energy X-ray detection. The detector of the former type demonstrated energy resolution of 56keV FWHM (11%) for 511keV γ-rays. Energy resolution of 1.81keV FWHM for 5.9keV was obtained from the detector of the latter type. In order to analyze noise characteristics of the detector-preamplifier assembly, the equivalent noise charge (ENC) was measured as a function of the amplifier shaping time for the high-resolution detector. This analysis shows that parallel white noise and /1/f noise were dominant noise sources in the detector system. Current-voltage characteristics of the TlBr detector with a small Peltier cooler were also measured. Significant reduction of the detector leakage current was observed for the cooled detectors.

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