MB形容器体积对BGO晶体探测效率的蒙特卡罗优化设计

The optimal volume of MB shape for BGO crystal detection efficiency designed by using Monte Carlo

本研究采用蒙特卡罗方法MCNP对BGO(Bi4Ge3O12)晶体探测器Marinelli Breaker(简称MB)容器的优化设计;气体放射源MB容器内的气体发生β+衰变后,接着正电子与负电子湮没后发射γ射线。设计中,首先通过计算γ射线的数量来确定BGO晶体探测器金属包壳厚度与峰值效率关系;计算结果显示当BGO金属包壳厚度为0.7mm^1.0mm时,峰值效率达到最大。根据这一金属尺寸,我们进一步设计了MB容器的最佳尺寸,这种尺寸使探测器的探测效率较高而费用较少。从而达到满足生产这种探测器的要求。

In this study, we use MCNP Monte Carlo method to optimize the design of MarineUi Beaker （MB） of BGO （Bi4 Ge3 O12 ）crystal detector which occurs β^＋ decay from the gas source and further produce positron and then positron-electron annihilation to produce γ ray. We first calculate the number of γ ray to detemine the relation between the thickness of metal layer of BGO crystals detector and the peak value efficiencies. Our results show that the peak value efficiency arrive the maximum value point when the metal layer with thickness of 0.7mm tol. 0mm. volume of M B who has high efficiency and low detector. Then we use this dimension to further design the optimal cost And this will meet the need of production for this