Improvement of the energy resolution of CdTe detectors by pulse height correction from waveform

TL;DR

This paper presents a waveform-based pulse height correction method that significantly improves the energy resolution of CdTe detectors for gamma-ray detection at room temperature.

Contribution

The authors developed a novel waveform correction technique to enhance the energy resolution of CdTe detectors, addressing hole trapping effects.

Findings

Achieved 2.0% FWHM energy resolution at 662 keV

Optimal performance at temperatures between -10°C and 0°C

Method improves energy resolution compared to traditional approaches

Abstract

Semiconductor detectors made of CdTe crystal have high gamma-ray detection efficiency and are usable at room temperature. However, the energy resolution of CdTe detectors for MeV gamma-rays is rather poor because of the significant hole trapping effect. We have developed a method to improve the energy resolution by correcting the pulse height using the waveform of the signal and achieved 2.0% (FWHM) energy resolution for 662keV gamma-rays. Best energy resolution was achieved at temperatures between -10 degrees C and 0 degrees C.