Energy resolution improvement of CdTe detectors by using the principal component analysis technique

摘要

AbstractIn this paper, we report on the application of the Principal Component Analysis (PCA) technique for the improvement of theγ-ray energy resolution of CdTe detectors. The PCA technique is used to estimate the amount of charge-trapping effect which is reflected in the shape of each detector pulse, thereby correcting for the charge-trapping effect. The details of the method are described and the results obtained with a CdTe detector are shown. We have achieved an energy resolution of 1.8 % (FWHM) at 662 keV with full detection efficiency from a 1 mm thick CdTe detector which gives an energy resolution of 4.5 % (FWHM) by using the standard pulse processing method.Highlights•The Principle Component Analysis technique is applied to sampled pulses from a CdTe detector.•A strong correlation between the charge-trapping effect and the first principal component is demonstrated.•An energy resolution of 1.8% at 662 keV is achieved with a 1 mm thick CdTe detector.