Spectroscopic properties of large-volume virtual Frisch-grid CdMnTe detectors

K. H. Kim, Chansun Park, Pilsu Kim, Shinhaeng Cho, Jinseo Lee, T. K. Hong, A. Hossain, A. E. Bolotnikov, R. B. James

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


CdMnTe(CMT) is a promising alternative material for use as a room-temperature radiation detector. Frisch-grid detectors have a simple configuration and outstanding spectral performance compared with other single-carrier collection techniques. The energy resolution of large-volume virtual Frisch-grid CMT detectors was tested by using several isotopes such as 57Co, 22 Na, 133Ba, and 137Cs together or separately. Energy resolutions of 6.7% and 2.1% were obtained for 122-keV 57Co and 662-keV 137Cs gamma rays, respectively, without using any additional signal processing techniques. Also, a 12-mm-thick CMT detector detected the 511-keV and 1.277-MeV gamma peaks of 22Na with values of the full width at half maximum (FWHM) of 2.7% and 1.5%, respectively. In addition, multiple low- and high-energy gamma peaks of 133Ba were well separated. The mobilitylifetime product calculated from the shift of the 662-keV photo-peak vs. bias by using Hecht’s equation was 7 × 10 −3 cm2/V. These results show the possibility of using CMT detectors in response to various requirements for gamma-ray detection at room-temperature.

Original languageEnglish
Pages (from-to)1761-1765
Number of pages5
JournalJournal of the Korean Physical Society
Issue number11
Publication statusPublished - 2015 Jun 20


  • CdMnTe
  • CdZnTe
  • Frisch-grid
  • Mobility-lifetime product
  • Traveling heater method

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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