N型碲锌镉探测器的制备和性能

Fabrication and performance of N type CdZnTe detector

碲锌镉(CZT)晶体由于原子序数高、禁带宽、密度大,制成低能γ射线和X射线探测器不需液氮冷却就能得到相当好的能量分辨率,且有相当高的探测效率,因此近年来发展迅速。我们实验室已制成φ8mm×1.7mm灵敏体积的CZT探测器,室温22℃下对241Am放射源59.54keV能量的γ射线能量分辨率可以达到2.06keV(FWHM)(未使用准直器),连续测量没有极化效应,并且具有很好的长期稳定性。

Cadmium zinc telluride （CZT） is one of the preferred material for the fabrication of X-ray and gamma-ray detector. Thanks to the relatively high atomic number, high density and wide band-gap, CZT detector possesses sharp energy resolution and high detection efficiency without cryogenic cooling. A prototype planar CZT detector with sensitive volume of Ф 8mm×1.7 mm has been fabricated and the gamma-ray spectra of ^241Am were obtained. At room temperature （22℃） and for the 59.54 keV peak, the FWHM can achieve 2.06 keV, while no polarization is observed and stability is very satisfactory.