4 pi direction sensitive gamma imager with RENA-3 readout ASIC

Yanfeng Du; Wen Li; Brian Yanoff; Jeffrey Gordon; Donald Castleberry

doi:10.1117/12.739073

24 September 2007 4 pi direction sensitive gamma imager with RENA-3 readout ASIC

Yanfeng Du, Wen Li, Brian Yanoff, Jeffrey Gordon, Donald Castleberry

Proceedings Volume 6706, Hard X-Ray and Gamma-Ray Detector Physics IX; 67060V (2007) https://doi.org/10.1117/12.739073
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.739073

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