High-resolution CdTe radiation detectors with single-polarity charge sensing technique

R. Tomie, K. Hitomi, T. Shoji, Y. Hiratate

Research output: Contribution to conferencePaper

Abstract

Cadmium telluride (CdTe) radiation detectors applied three-electrode and pixel structure have been fabricated from commercially available CdTe crystals (2 mm thick). In case of a three-electrode detector, the cathode was 6×6 mm 2, the anode was 0.5 mm in diameter and the third electrode surrounding the anode was 1 mm width. The gap between the third electrode and the anode was 0.25 mm. In case of pixel detectors, the anodes were 9 pixels and the guardring surrounded the pixels. One pixel detector has rectangular 1.35×1.35 mm 2 pixels with 1.45 mm pitch and the other pixel detector has rectangular 0.7×0.7 mm 2 pixels with 0.8 mm pitch. All electrodes were formed on the crystals by vacuum evaporation of Au. Pulse height spectra of gamma-rays emitted from a 137Cs source were acquired with the fabricated detectors. The three-electrode detectors were operated with the anode voltage of +10 V, the cathode voltage of -540 V and the third electrode grounded. An energy resolution of 6.0 keV FWHM was recorded for 662 keV gamma-rays at room temperature. The pixel detectors with 1.35×1.35 mm 2 pixels and with 0.7×0.7 mm 2 pixels have exhibited energy resolutions of 16.7 keV and 12.3 keV FWHM at 662 keV, respectively. The pixel detectors were operated at 600 V and at room temperature. Detailed discussions about the device fabrication, operation and characterization will be given in this paper.

Original languageEnglish
Pages2313-2315
Number of pages3
Publication statusPublished - 2002 Aug 31
Event2001 IEEE Nuclear Science Symposium Conference Record - San Diego, CA, United States
Duration: 2001 Nov 42001 Nov 10

Other

Other2001 IEEE Nuclear Science Symposium Conference Record
CountryUnited States
CitySan Diego, CA
Period01/11/401/11/10

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Industrial and Manufacturing Engineering

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    Tomie, R., Hitomi, K., Shoji, T., & Hiratate, Y. (2002). High-resolution CdTe radiation detectors with single-polarity charge sensing technique. 2313-2315. Paper presented at 2001 IEEE Nuclear Science Symposium Conference Record, San Diego, CA, United States.