Performance of CdZnTe strip detectors as sub-millimeter resolution imaging gamma radiation spectrometers

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:513103

Mayer, M; Boykin, D V; Drake, A ^[1]

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1. Univ. of New Hampshire, Durham, NH (United States); and others

We report {gamma}-ray detection performance measurements and computer simulations of a sub-millimeter pitch CdZnTe strip detector. The detector is a prototype for {gamma}-ray astronomy measurements in the range of 20-200 keV. The prototype is a 1.5 mm thick, 64 x 64 orthogonal stripe CdZnTe detector of 0.375 mm pitch in both dimensions, with approximately one square inch of sensitive area. Using discrete laboratory electronics to process signals from 8 x 8 stripe region of the prototype we measured good spectroscopic uniformity and sub-pitch ({approximately} 0.2 mm) spatial resolution in both x and y dimensions. We present below measurements of the spatial uniformity, relative timing and pulse height of the anode and cathode signals, and the photon detection efficiency. We also present a technique for determining the location of the event in the third dimension (depth). We simulated the photon interactions and signal generation in the strip detector and the test electronics and we compare these results with the data. The data indicate that cathode signal - as well as the anode signal - arises more strongly from the conduction electrons rather than the holes.

• OSTI ID: 513103
• Report Number(s): CONF-961123--
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
CDTE SEMICONDUCTOR DETECTORS
GAMMA DETECTION
GAMMA SPECTROMETERS
IMAGE PROCESSING
PERFORMANCE
ZINC COMPOUNDS