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Proceedings Paper

Design of a coded aperture Compton telescope imaging system (CACTIS)
Author(s): Alexander Volkovskii; Martin Clajus; Stephen R. Gottesman; Hans Malik; Kenneth Schwartz; Evren Tumer; Tumay Tumer; Shi Yin
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Paper Abstract

We have developed a prototype of a scalable high-resolution direction and energy sensitive gamma-ray detection system that operates in both coded aperture (CA) and Compton scatter (CS) modes to obtain optimal efficiency and angular resolution over a wide energy range. The design consists of an active coded aperture constructed from 52 individual CZT planar detectors each measuring 3×3×6 mm3 arranged in a MURA pattern on a 10×10 grid, with a monolithic 20×20×5 mm3 pixelated (8×8) CZT array serving as the focal plane. The combined mode is achieved by using the aperture plane array for both Compton scattering of high-energy photons and as a coded mask for low-energy radiation. The prototype instrument was built using two RENA-3 test systems, one each for the aperture and the focal plane, stacked on top of each other at a distance of 130 mm. The test systems were modified to coordinate (synchronize) readout and provide coincidence information of events within a user-adjustable 40-1,280 ns window. The measured angular resolution of the device is <1 deg (17 mrad) in CA mode and is predicted to be approximately 3 deg (54 mrad) in CS mode. The energy resolution of the CZT detectors is approximately 5% FWHM at 120 keV. We will present details of the system design and initial results for the calibration and performance of the prototype.

Paper Details

Date Published: 2 September 2010
PDF: 13 pages
Proc. SPIE 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII, 78051V (2 September 2010); doi: 10.1117/12.862995
Show Author Affiliations
Alexander Volkovskii, Nova R&D, Inc. (United States)
Martin Clajus, Nova R&D, Inc. (United States)
Stephen R. Gottesman, Northrop Grumman Electronic Systems (United States)
Hans Malik, Northrop Grumman Electronic Systems (United States)
Kenneth Schwartz, Northrop Grumman Electronic Systems (United States)
Evren Tumer, Nova R&D, Inc. (United States)
Tumay Tumer, Nova R&D, Inc. (United States)
Shi Yin, Nova R&D, Inc. (United States)


Published in SPIE Proceedings Vol. 7805:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII
Arnold Burger; Larry A. Franks; Ralph B. James, Editor(s)

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