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24 September 2007 4 pi direction sensitive gamma imager with RENA-3 readout ASIC
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A 4π direction-sensitive gamma imager is presented, using a 1 cm3 3D CZT detector from Yinnel Tech and the RENA-3 readout ASIC from NOVA R&D. The measured readout system electronic noise is around 4-5 keV FWHM for all anode channels. The measured timing resolution between two channels within a single ASIC is around 10 ns and the resolution is 30 ns between two separate ASIC chips. After 3D material non-uniformity and charge trapping corrections, the measured single-pixel-event energy resolution is around 1% for Cs-137 at 662 keV using a 1 cm3 CZT detector from Yinnel Tech with an 8 x 8 anode pixel array at 1.15 mm pitch. The energy resolution for two pixel events is 2.9%. A 10 uCi Cs-137 point source was moved around the detector to test the image reconstruction algorithms and demonstrate the source direction detection capability. Accurate source locations were reconstructed with around 200 two-pixel events within a total energy window ±10 keV around the 662 keV full energy peak. The angular resolution FWHM at four of the five positions tested was between 0.05-0.07 steradians.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yanfeng Du, Wen Li, Brian Yanoff, Jeffrey Gordon, and Donald Castleberry "4 pi direction sensitive gamma imager with RENA-3 readout ASIC", Proc. SPIE 6706, Hard X-Ray and Gamma-Ray Detector Physics IX, 67060V (24 September 2007);

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