We present results from two 1 cm(3) CdZnTe gamma-ray spectrometers with ful
l 3-D position sensitivity. To our knowledge, these are the first reported
semiconductor spectrometers that provide independent spectral data for each
of over 2000 volume elements. Energy resolutions of 1.5-1.6% FWHM and posi
tion resolutions of 0.7 x 0.7 x 0.5 mm were obtained at 662 keV gamma-ray e
nergy from the central region of both detectors for single-pixel events. Wi
th the 3-D position sensing capability variations in spectral response over
the detector volume were recorded using a Cs-137 source. These measurement
s allow a study of full-energy peak efficiency, mean ionization energy and
electron trapping as a function of 3-D position. The effects of material no
n-uniformity on detector spectroscopic performance are discussed. (C) 2000
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