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Spectroscopic Performance of Thick HgI2 Detectors.

L J Meng1, Z He1, B Alexander2

  • 1Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109 USA.

IEEE Transactions on Nuclear Science
|March 3, 2017
PubMed
Summary
This summary is machine-generated.

Newly developed pixelated mercuric iodide (HgI2) detectors show excellent spectroscopic performance with energy resolutions up to 1.3%. Electron mobility-lifetime products and variations in detector properties were also characterized.

Keywords:
HgI2Spectroscopic Performance

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Area of Science:

  • Semiconductor detector development
  • Nuclear instrumentation
  • Materials science

Background:

  • Pixelated detectors offer improved spatial resolution for radiation detection.
  • Mercuric iodide (HgI2) is a promising material for room-temperature semiconductor detectors.
  • Characterizing detector performance is crucial for optimizing applications.

Purpose of the Study:

  • To evaluate the spectroscopic performance of novel pixelated HgI2 detectors.
  • To measure key electronic properties, including electron mobility-lifetime product and electron lifetime.
  • To investigate spatial uniformity of detector response and internal electric fields.

Main Methods:

  • Fabrication and characterization of two pixelated HgI2 detectors (1x1x0.814 cm3 and 1x1x1.016 cm3).
  • Signal readout using discrete electronics with A-250 pre-amplifiers and digital oscilloscope.
  • Application of depth sensing technique to correct for depth-dependent photopeak variations.

Main Results:

  • Achieved energy resolutions between 0.85% and 1.3%.
  • Measured electron mobility-lifetime product of approximately 1x10^-2 cm^2/V and electron lifetime of ~200 μs.
  • Observed variations in electron drifting properties and significant non-uniformity in internal electric field strength across anode pixels.

Conclusions:

  • The developed pixelated HgI2 detectors demonstrate high spectroscopic performance.
  • Characterization revealed important electron transport properties and spatial non-uniformities.
  • Further optimization of detector design and fabrication is needed to address field non-uniformity.