کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1824771 | 1027344 | 2011 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: CZT performance for different anode pixel geometries and data corrections CZT performance for different anode pixel geometries and data corrections](/preview/png/1824771.png)
We have investigated the energy resolution and absolute photopeak efficiency of CZT detectors with three anode pixel geometries after three data correction steps. Before data corrections, the energy resolution is 4–5% at 122 keV, and the efficiency is 46–70% for a 21 keV photopeak window. Charge sharing events, which make up 10–25% of all events, are a significant cause of the poor efficiency. We discovered that large gaps between anode pixels have a strong negative impact on both charge sharing and absolute photopeak efficiency. Using three-dimensional position-dependent energy corrections, we were able to compensate for some of this reduced sensitivity, increasing the efficiency by up to 35% to a final efficiency of 62–80% of incoming gamma events.
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 648, Supplement 1, 21 August 2011, Pages S37–S41