Mini Compton Camera Based on an Array of Virtual Frisch-Grid CdZnTe Detectors

Wonho Lee, Aleksey Bolotnikov, Taewoong Lee, Giuseppe Camarda, Yonggang Cui, Rubi Gul, Anwar Hossain, Roy Utpal, Ge Yang, Ralph James

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


We constructed a mini Compton camera based on an array of CdZnTe detectors and assessed its spectral and imaging properties. The entire array consisted of 6 × 6 Frisch-grid CdZnTe detectors, each with a size of 6 × 6 ×15mm3. Since it is easier and more practical to grow small CdZnTe crystals rather than large monolithic ones, constructing a mosaic array of parallelepiped crystals can be an effective way to build a more efficient, large-volume detector. With the fully operational CdZnTe array, we measured the energy spectra for 133Ba} - 137Cs - , 60Co-radiation sources; we also located these sources using a Compton imaging approach. Although the Compton camera was small enough to hand-carry, its intrinsic efficiency was several orders higher than those generated in previous researches using spatially separated arrays, because our camera measured the interactions inside the CZT detector array, wherein the detector elements were positioned very close to each other. The performance of our camera was compared with that based on a pixelated detector.

Original languageEnglish
Article number7407479
Pages (from-to)259-265
Number of pages7
JournalIEEE Transactions on Nuclear Science
Issue number1
Publication statusPublished - 2016 Feb 1


  • CdZnTe
  • Compton camera
  • Frisch-grid
  • electronic collimation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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