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在反应堆、高能电子加速器、质子和重离子束加速器以及深太空探测领域中,中子的辐射防护非常重要,因此,需要对中子剂量转换系数进行研究。目前基于不同体模的剂量转换系数研究是国际上辐射防护领域的一大研究热点。该文利用中国人体素模型CVP(Chinese voxel phantom)及MCNP程序,模拟不同能量、不同照射方式下单能中子在人体内的输运,得到了一系列精度较高的器官吸收剂量转换系数,并将结果与其他两套数据,即基于另一体素体模VCH(visible Chinese human phatom)和中国参考人数学体模CMP(Chinese mathmatical phantom)的结果,进行了比较分析。结果表明:由于个体之间以及与中国参考人之间的差异,基于不同体模的器官吸收剂量转换系数之间的差别可达30%～40%。该结果对于分析个体之间中子剂量转换系数的差异,以及由数学体模和体素体模的区别所引起的剂量学数据差异很有意义。
In the field of reactors, high energy electron accelerators, proton and heavy ion beam accelerators, and deep space exploration, the protection of neutrons from radiation is of great importance and therefore the need to study the neutron dose conversion factor. At present, the research on DFT based on different phantoms is a hot research topic in the field of radiation protection in the world. In this paper, Chinese voxel phantom (CVP) and MCNP program are used to simulate the transport of single energy neutrons in human body under different energy and different irradiation modes. A series of high-precision organ absorption dose conversion coefficients are obtained, The results were compared with the other two sets of data, namely the results based on the VCH (visible Chinese human phatom) and the Chinese mathmatical phantom (CMP). The results show that, due to the differences between individuals and reference persons in China, the difference between the dose conversion coefficients of organ absorption based on different phantoms can reach 30% ~ 40%. This result makes sense for analyzing the differences in individual neutron dose conversion coefficients and differences in dosimetry data due to differences between mathematical and voxel phantoms.