Hard X- and γ-ray measurements with a 3×3×2mm3 CdZnTe detector

Abstract

Abstract We report the results of a series of X- and γ-ray measurements on a 3 × 3 mm 2 , 2 mm thick CdZnTe detector carried out at the HASYLAB and ESRF synchrotron radiation facilities. The detector energy response function was found to be linear over the energy range 10–100 keV with an average rms non-linearity of 0.6%, consistent with statistics. Under full area illumination, the FWHM energy resolution was 270 eV at 5.9 keV and rises to 930 eV at 59.54 keV. Under pencil beam illumination, the measured energy resolution at 10 keV was 310 eV FWHM and rises to ∼1000 eV at 100 keV. At 60 keV the resolution was found to be ∼30% lower than that measured under uniform illumination, indicating a degree of non-uniform crystallinity and stoichiometry in the bulk. For energies