Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Changes in detection characteristics of CdTe X-ray sensors by proton irradiation
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment ( IF 1.5 ) Pub Date : 2020-05-08 , DOI: 10.1016/j.nima.2020.164116
O. Grimm , M. Bednarzik , G. Birrer , V. Commichau

This paper reports on the performance changes in CdTe:Cl semiconductor X-ray detectors seen after irradiation with 50 MeV protons up to a fluence of 1.61011cm−2. The rationale for the irradiation parameters is described. Performance was quantified before and after irradiations by obtaining X-ray spectra with a barium-133 radioactive source and detectors cooled to −20°C. Energy resolutions, electron and hole drift lengths, and energy calibration parameters were extracted by fitting model spectra to the data. Ten crystals of dimension 10×10×1 mm3 were used, with two each being irradiated to 20%, 40%, 60%, 80%, and 100% of the maximum fluence. Each crystal is pixelized and the eight large pixels of area 9.6 mm2 are analysed separately to allow estimation of uncertainties.

The main observations are a strong decrease of the electron drift length and an increase of the electronic noise with fluence. The hole drift length shows a tendency to increase with fluence. A basic interpretation of some observations in terms of an increasing density of acceptor trap levels with fluence is given.



中文翻译:

质子辐照CdTe X射线传感器的探测特性变化

本文报道了用50 MeV质子辐照至1.6的注量辐照后CdTe:Cl半导体X射线探测器的性能变化10 11厘米-2。描述了照射参数的原理。通过使用钡133放射源和冷却至-20°C的检测器获得X射线光谱来量化辐照前后的性能。通过将模型光谱拟合到数据中来提取能量分辨率,电子和空穴漂移长度以及能量校准参数。十个尺寸为10的晶体×10×使用1 mm 3,分别以最大通量的20%,40%,60%,80%和100%照射两个。每个晶体都被像素化,分别分析面积为9.6 mm 2的八个大像素,以估计不确定性。

主要观察结果是电子漂移长度的强烈减小和电子能量随通量的增加。空穴漂移长度显示出随着通量增加的趋势。给出了一些观察结果的基本解释,即随着通量的增加,受体陷阱水平的密度增加。

更新日期:2020-05-08
down
wechat
bug