CZT quasi-hemispherical detectors with improved spectrometric characteristics

At present time various CZT detectors of different designs and sizes are widely and successfully used for different applications due to its favorable detection properties. Among them there are hemispherical or quasi-hemispherical detectors. These detectors have rather simple design and do not require special electronics for application. Development of quasi-hemispherical detectors fabrication methods allows noticeable improves detector´s spectrometric performance due to a charge collection optimization. This will allow increasing the yield of high quality detectors. For example energy resolution at 662 keV line and peak-to-Compton ratio of the quasi-hemispherical detector with volume of 150 mm³ were improved from 27 keV and 2.5 to 13 keV and 4.9 correspondingly. Total absorption peaks efficiencies in all energy range remained without changes. At that, improvements were obtained without increasing of detectors high operation voltages and without application of any pulse shape correction/selection schemes.