一种超铀核素致伤口污染成像探测装置的模拟和分析

Simulation and analysis of an imaging detection device for woundcontamination caused by transuranic nuclides

目的为解决超铀核素对伤口的放射性污染问题,开展基于编码孔成像技术的伤口辐射成像研究。方法通过蒙特卡罗模拟多种源项,比较两种图像重建算法在近场条件下成像效果的差异,以及探测器像素和成像平面像素数量对图像分辨率的影响。结果根据设计的尺寸进行成像系统模拟工作,模拟成像视野为89.4 mm×89.4 mm,模拟角分辨率为1.98°,根据对比不同条件下重建点源的平均半高宽,得出增加探测器和成像平面中的像素数量可以优化角分辨率,但显著延长蒙特卡罗模拟时间。结论根据模拟结果,该成像系统的参数可以有效的对放射性污染进行成像,为超铀核素致伤口污染测量提供了方法支持,同时为后续实际伤口污染成像探测系统的研发奠定基础。

Objective To address the radioactive contamination of wounds caused by transuranic nuclides,wound radiation imaging based on coded aperture imaging technology was investigated.Methods By simulating multiple source terms using Monte Carlo method,the differences in imaging performance between two image reconstruction algorithms under near-field conditions were compared.The effects of detector pixels and detection plane pixels on image resolution were investigated.Results The imaging system was simulated based on the designed dimensions.The simulated imaging field of view was 89.4 mm×89.4 mm and the simulated angular resolution was 1.98°.Based on the comparison of the average width at half height of the reconstructed point sources under different conditions,it was found that increasing the number of pixels in the detector and detection plane optimized the angular resolution but significantly prolonged the Monte Carlo simulation time.Conclusion According to the simulation results,the parameters of the imaging system can be used to effectively image radioactive contamination.Our results provide methodological support for the measurement of wound contamination caused by transuranic nuclides,and lay the foundation for the development of wound contamination imaging detection systems in the future.