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TitleDevelopment of a Compton Imager Based on Bars of Scintillator
AuthorMacLeod, A M L; Boyle, P J; Hanna, D S; Saull, P R B; Sinclair, L EORCID logo; Seywerd, H C J
SourceNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment vol. 767, 2014 p. 397-406, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20140132
PublisherElsevier BV
Mediapaper; digital; on-line
File formatpdf
ProgramCanadian Hazard Information Service
Released2014 12 01
AbstractWe have developed a compact Compton gamma-ray imager with a large field of view and a low channel-count that is capable of quickly localizing gamma-ray sources in the few hundred keV -- several MeV range. The two detector planes (scatter and absorber) employ bars of NaI(Tl) read out by photomultiplier tubes (PMTs) located at each end. The long-range imaging performance has been tested from 392 keV to 1274 keV. An angular resolution measure of 2.72 degrees ± 0.06 degrees and an efficiency of (1.79 ± 0.04) × 10{-3\} at 662 keV is obtained. A Cs-137 (662 keV) source equivalent to a 10 mCi source 40 m away can be located in 60 seconds with an uncertainty of about a degree. No significant degradation in imaging performance is observed for source angles up to 40 degrees off axis.
Summary(Plain Language Summary, not published)
Prompted by the needs of NRCan's Nuclear Emergency Response group under the Canadian Hazards Information Service, we built a gamma imager which can show the locations of radioactivity overlaid on a photograph of the surroundings. The imager is innovative and of scientific interest in the fields of radiation detection, medical imaging, and light collection. Performance tests of the imager taken in 2012 are presented in this paper.

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