Absolute full-energy peak efficiency calibration of a Clover-BGO detector system

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Abstract

An absolute full-energy peak efficiency calibration of a Clover-type composite germanium gamma-ray detector system is presented. The efficiency curve was measured in the energy range of 120keV-12.2MeV for the first time, using the combination of proton-capture nuclear reactions and radioactive sources, such as 56Co, 60Co, 66Ga and 152Eu. At high energies gamma-ray pairs from proton resonance capture on 27Al, 23Na, 39K and 11B were employed using evaporated Al, Na2WO4, K2SO4 and LiBO2 targets, respectively. The experimental data were fitted with a single polynomial function on log-log scale using a recently developed method. The add-back factor is found to increase quadratically with the energy, in contrast to the previously suggested linear relationship. The efficiency gain with respect to a single detector is about one order of magnitude at 10 MeV energy.

Original languageEnglish
Pages (from-to)580-588
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume503
Issue number3
DOIs
Publication statusPublished - May 11 2003

Keywords

  • Add-back mode
  • BGO
  • Clover
  • Compton-suppression
  • Gamma-ray detection
  • High-energy efficiency calibration
  • PGAA
  • PIGE
  • Point-pair method
  • Proton resonance capture

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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