CAJ | 학술논문

目的对现有的红骨髓剂量模拟计算方法进行比较和分析.为确定更为合理的计算方法提供依据.方法借助MCNPX蒙特卡罗模拟软件,模拟了能量20 keV～10 MeV的γ光子源,对Rensselaer理工学院(RPI)体素人体模型进行前后(AP)全身均匀照射,分别采用直接能量沉积法、剂量响应函数法(DRF)、King-Spiers因子法和质能吸收系数法(MEAC),进行红骨髓剂量的模拟计算.结果在入射γ光子能量低于100 keV时,直接能量沉积法的结果最大,而质能吸收系数法和King-Spiels因子法的结果更为合理;在入射γ光子能量高于150 keV时,King-Spiers因子法给出的结果要略高于其他方法的结果,但其能够反映出红骨髓对γ光子能量更强的吸收能力.结论综合比较低能区和高能区不同方法给出的结果后,发现King-Spiers因子法是最合理的估算红骨髓剂量的方法.
목적 대현유적홍골수제량모의계산방법진행비교화분석.위학정경위합리적계산방법제공의거.방법 차조MCNPX몽특잡라모의연건,모의료능량20 keV～10 MeV적γ광자원,대Rensselaer리공학원(RPI)체소인체모형진행전후(AP)전신균균조사,분별채용직접능량침적법、제량향응함수법(DRF)、King-Spiers인자법화질능흡수계수법(MEAC),진행홍골수제량적모의계산.결과 재입사γ광자능량저우100 keV시,직접능량침적법적결과최대,이질능흡수계수법화King-Spiels인자법적결과경위합리;재입사γ광자능량고우150 keV시,King-Spiers인자법급출적결과요략고우기타방법적결과,단기능구반영출홍골수대γ광자능량경강적흡수능력.결론 종합비교저능구화고능구불동방법급출적결과후,발현King-Spiers인자법시최합리적고산홍골수제량적방법.
Objective To provide evidence for a more reasonable method of determining red bone marrow dose by analyzing and comparing existing simulation methods.Methods By utilizing Monte Carlo simulation software MCNPX,the absorbed doses of red hone marrow of Rensselaer Polytechnic Institute (RPI)adult female voxel phantom were calculated throush 4 different methods:direct energy deposition.dose response function(DRF),King-Spiers factor method and mass-energy absorption coefficient (MEAC).The radiation sources were defined as infinite plate.sources with the energy ranging from 20 keV to 10 MeV.and 23 sources with different energies were simulated in total.The source was placed right next to the front of the RPI model to achieve a homogeneous anteroposterior radiation scenario.The results of different simulated photon energy sources through different methods were compared.Results When the photon energy was lower than 100 key,the direct energy deposition method gave the highest result while the MEAC and King-Spiers factor methods showed more reasonable results.When the photon energy was higher than 150 keV taking into account of the higher absorption ability of red bone marrow at highcr photon energy,the result of the King-Spiers factor method was larger than those of other methods.Conclusions The King-Spiers factor method might be the most reasonable method to estimate the red bone marrow dose from external radiation.