Investigation of room temperature nuclear radiation CdZnTe pixel array detector

Cadmium zinc telluride (CZT) is one of the preferred material for the fabrication of X-ray and gamma-ray detector. Because of the relatively high atomic number, high density and wide band-gap, CZT detector can achieve sharp energy resolution and high detection efficiency without cryogenic cooling. A CZT detector has been fabricated and the gamma-ray spectra of Co and Cs were obtained. At room temperature, the energy resolution of the detector is 23.7% (28.9 keV FWHM) for 122 keV ⁵⁷Co and 17.9% (117.8 keV FWHM) for 662 keV, ¹³⁷Cs, respectively. The spectrum is gauss distributing, and low energy band tail is sharp, which shows that the effect of hole is weak, while no polarization is observed and stability is very satisfactory.