Properties of Redlen cadmium zinc telluride with respect to x-ray spectroscopy
We present a study of a sample pixelated cadmium zinc telluride (CZT) detector using CZT purchased from Redlen Technologies. We demonstrate that the material shows good uniformity across the 2 cm × 2 cm × 3 mm crystal in terms of leakage current, gain, and spectral resolution. We find that the detector produces very good spectral resolution for energies up to at least 105 keV, achieving a full-width at half-maxima of 450 eV at 14 keV up to 880 eV at 105 keV using only single-pixel events. Though our analysis of spectra including multiple-pixel events is somewhat limited, we also produce a spectrum including events in which photon energy is deposited across two adjacent pixels. We find that this degrades the energy resolution by up to 30%, but this result can likely be improved using more rigorous calibrations. Additionally, we investigate depth-of-interaction effects, showing that spectral resolution can be improved by 3% to 7% for energies between 86 and 105 keV by removing events beyond a certain depth. Performing this cut reduces efficiency, removing 13% to 21% of photons from the resulting spectral lines.
Additional Information© 2022 Society of Photo-Optical Instrumentation Engineers (SPIE). We would like to thank the anonymous reviewers for their suggestions, which have significantly improved the quality of this work. This work was supported by NASA (Grant No. NNX13AC55G). Milan Sharma Mandigo-Stoba also acknowledges support from the Larson Fellowship via the Caltech Summer Undergraduate Research Fellowships program. To the best of our knowledge, there exist no conflicts of interest with regards to this manuscript.
Published - 046002_1.pdf