Title :
CdZnTe strip detectors as sub-millimeter resolution imaging gamma radiation spectrometers
Author :
Larson, K. ; Boykin, D.V. ; Cherry, M.L. ; Courville, J.F. ; Doty, F.P. ; Drake, A. ; Guzik, T.G. ; Hamel, L.A. ; Macri, J.R. ; Mayer, M. ; McConnell, M.L. ; Ryan, J.M. ; Tousignant, O.
Author_Institution :
Space Sci. Center, New Hampshire Univ., Durham, NH, USA
Abstract :
We report γ-ray detection performance measurements and computer simulations of a sub-millimeter pitch CdZnTe strip detector. The detector is a prototype for γ-ray measurements in the range of 20-600 keV. The prototype is a 1.5 mm thick, 64×64 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 an 8×8 stripe region of the prototype we measured good spectroscopic uniformity and sub-pitch (~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. 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
Keywords :
II-VI semiconductors; biomedical equipment; cadmium compounds; gamma-ray detection; gamma-ray spectrometers; image resolution; position sensitive particle detectors; positron emission tomography; semiconductor counters; single photon emission computed tomography; zinc compounds; γ-ray detection performance measurements; 0.375 mm; 1 in; 1.5 mm; 20 to 600 keV; CdZnTe; CdZnTe strip detectors; PET devices; SPECT devices; anode signals; cathode signals; computer simulations; conduction electrons; discrete laboratory electronics; holes; orthogonal stripe CdZnTe detector; photon interactions; pulse height; relative timing; sensitive area; signal generation; spatial uniformity; spectroscopic uniformity; sub-millimeter pitch; sub-millimeter resolution imaging gamma radiation spectrometers; sub-pitch spatial resolution; x dimensions; y dimensions; Anodes; Cathodes; Electronic equipment testing; Gamma ray detection; Gamma ray detectors; Image resolution; Optical imaging; Prototypes; Pulse measurements; Strips;
Conference_Titel :
Bioengineering Conference, 1997., Proceedings of the IEEE 1997 23rd Northeast
Conference_Location :
Durham, NH
Print_ISBN :
0-7803-3848-0
DOI :
10.1109/NEBC.1997.594956