摘要
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。
Neutron radiation protection is very important near reactors, high-energy electron accelerators, proton and heavy ion accelerators and deep space explorations. Such dose conversion coefficients which are studied based on phantoms are a hot topic in the radiation protection field. This study uses Chinese voxel phantom （CVP） and the Monte Carlo N-particle transport code program （MCNP） to simulate neutron transport for different energies and different irradiation geometries in the human body to obtain accurate organ dose conversion coefficients. The results were compared with data based on the visible Chinese human phantom （VCH） and the Chinese mathmatical phantom （CMP）. The results indicate that the differences between the organ dose conversion coefficients based on the different phantoms can reach 30% -40%.These results can be used to analyze the differences in neutron dose conversion coefficients between different individuals and discrepancies in dosimetry data due to the differences between the mathematical phantom and the voxel phantom.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第7期906-910,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(11105081
11075091)
关键词
剂量
转换系数
体模
中子外照射
dose
conversion eoefficient
phantom
neutron external exposure
