Resolution improvement in CdTe gamma detectors using pulse-shape discrimination

Abstract Pulse-shape discrimination has been used to improve significantly the resolution of CdTe gamma detectors. By selecting those pulses with risetimes less than 100 ns, the full width at half maximum (fwhm) resolution at 661 keV may be reduced to 14 keV at room temperatures and 8 keV at 0°C. The resulting peaks have a full width at tenth maximum (fwtm) less than twice the fwhm and may readily be identified and integrated using standard spectrum-analysis techniques.