Useche Parra Juan S, Roque Gerardo, Schütz Michael K, Fiederle Michael, Procz Simon
Freiburg Materials Research Center, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg im Breisgau, Germany.
Sensors (Basel). 2024 Dec 13;24(24):7974. doi: 10.3390/s24247974.
Nuclear power plant decommissioning requires the rapid and accurate classification of radioactive waste in narrow spaces and under time constraints. Photon-counting detector technology offers an effective solution for the quick classification and detection of radioactive hotspots in a decommissioning environment. This paper characterizes a 5 mm CdTe Timepix3 detector and evaluates its feasibility as a single-layer Compton camera. The sensor's electron mobility-lifetime product and resistivity are studied across bias voltages ranging from -100 V to -3000 V, obtaining values of μeτe = (1.2 ± 0.1) × 10 cmV, and two linear regions with resistivities of ρI=(5.8±0.2) GΩ cm and ρII=(4.1±0.1) GΩ cm. Additionally, two calibration methodologies are assessed to determine the most suitable for Compton applications, achieving an energy resolution of 16.3 keV for the Cs photopeak. The electron's drift time in the sensor is estimated to be (122.3 ± 7.4) ns using cosmic muons. Finally, a Compton reconstruction of two simultaneous point-like sources is performed, demonstrating the detector's capability to accurately locate radiation hotspots with a ∼51 cm resolution.
核电站退役需要在狭窄空间且时间紧迫的情况下对放射性废物进行快速准确的分类。光子计数探测器技术为退役环境中放射性热点的快速分类和检测提供了一种有效的解决方案。本文对一款5毫米碲化镉Timepix3探测器进行了特性描述，并评估了其作为单层康普顿相机的可行性。研究了该传感器在-100伏至-3000伏偏置电压范围内的电子迁移率-寿命乘积和电阻率，得到μeτe = (1.2 ± 0.1) × 10 cmV的值，以及电阻率分别为ρI=(5.8±0.2) GΩ cm和ρII=(4.1±0.1) GΩ cm的两个线性区域。此外，评估了两种校准方法以确定最适合康普顿应用的方法，对于铯光峰实现了16.3 keV的能量分辨率。利用宇宙μ子估计传感器中电子的漂移时间为(122.3 ± 7.4)纳秒。最后，对两个同时存在的点状源进行了康普顿重建，证明了该探测器能够以约51厘米的分辨率准确地定位辐射热点。
