We report performance measurements of a sub-millimeter resolution CdZnTe strip detector developed as a prototype for astronomical instruments operating with good efficiency in the 30-300 keV photon energy range. The prototype is a 1.4 mm thick, 64×64 contact stripe CdZnTe array of 0.375 mm pitch in both dimensions. Pulse height spectra were recorded in orthogonal-stripe coincidence mode which demonstrate room-temperature energy resolution <10 keV (FWHM) for 122 keV photons with a peak-to-valley ratio >5:1. Good response is also demonstrated at higher energies using a coplanar grid readout configuration. Spatial resolution capabilities finer than the stripe pitch are demonstrated. We present the image of a 133Ba source viewed through a collimator slit produced by a 4×4 stripe detector segment. Charge signals from electron and hole collecting contacts are also discussed.
Nuclear Science Symposium and Medical Imaging Conference Record, 1995. IEEE
Digital Object Identifier (DOI)
Macri, J.R.; Apotovsky, B.A.; Butler, J.F.; Cherry, M.L.; Dann, B.K.; Drake, A.; Doty, F.P.; Guzik, T.G.; Larson, K.; Mayer, M.; McConnell, M.L.; Ryan, J.M., "Development of an orthogonal-stripe CdZnTe gamma radiation imaging spectrometer," Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE , vol.1, no., pp.174,178 vol.1, 21-28 Oct 1995.