Development of the cadmium zinc TElluride Radiation Imager (TERI)

Abstract

The cadmium zinc TElluride Radiation Imager, or TERI, is an instrument to space qualify large-volume $4\times 4\times 1.5{\mathrm{cm}}^3$ pixelated CdZnTe (CZT) detector technology. The CZT's anode is composed of a $22\times 22$ array of pixels while the cathode is planar. TERI will contain four of those crystals with each pixel having an energy range of $40\mathrm{keV}$ up to $3\mathrm{MeV}$ with a resolution of $1.3\%$ full-width-at-half maximum at $662\mathrm{keV}$ all while operating in room temperature. As the detectors are 3D position sensitive, TERI can Compton image events. TERI is fitted with a coded-aperture mask which permits imaging low energy photons in the photoelectric regime. TERI's primary mission is to space-qualify large-volume CZT and measure its degradation due to radiation damage in a space environment. Its secondary mission includes detecting and localizing astrophysical gamma-ray transients. TERI is manifested on DoD's STP-H10 mission for launch to the International Space Station in early 2025.

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