β-γ混合场叠层闪烁体探测器选材及其结构模拟设计

Material Selection and Structural Simulation Design ofβ-γMixed Field Laminated Scintillator Detector

为了对f-y混合场探测器的闪烁体材料及结构进行优化,设计了一种新的甄别原理并利用MCNP5模拟计算了不同能量的β射线和γ射线在不同闪烁体内的能量沉积行为。模拟结果表明,探头材料第一层采用NE102A(厚度为0.15 mm),第二层采用6 mm的CaF2(Eu),第三层采用CsI(Na)可以获得更多的光子数从而提商探测器的能量分辨率。对于0.05~3 MeV的β射线,其理论误甄别率不超过0.0019%,对于0.05~3.5 MeV的r光子.其理论误甄别率不超过0.2236%。

In order to optimize the scintillator material and design the structure of the p-y mixed field detector,a new discrimination principle was designed and MCNP5 was used to simulate the 412 energy deposition behavior ofβand y with different energies in different scintillators.The simulation results show that the first layer of the probe material uses NE102A material(with a thickness of 0.15 mm),the second layer uses 6 mm CaF_(2)(Eu),and the third layer uses CsI(Na)to obtain more photons,thereby increasing the detector’s performance of energy resolution.For theβof 0.05-3 MeV,the theoretical misdetection rate does not exceed 0.0019%,and for theγof 0.05-3.5 MeV,the theoretical misdetection rate does not exceed 0.2236%.