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利用M on te C arlo方法结合小体积元人体模型对航天员空间质子辐射剂量进行估算。使用核磁共振全身扫描图像,通过识别组织器官,再利用参考人数据,建立由4mm×4mm×4mm小体积元组成的人体模型。该人体模型包括23种辐射敏感器官,并用查找表技术压缩模型数据。使用GEANT 4 M on te C arlo程序包,结合该模型,计算得到各个组织器官单能质子入射下的微分剂量估计谱库。对空间质子微分注量谱和微分剂量能谱积分,得到空间辐射剂量估计值。估算出1972年8月太阳质子事件的皮肤当量剂量为9 256 cSv,与文献值9 350 cSv相近,验证了算法的可行性。
The proton radiation dose of astronauts was estimated by MonteCarlo method combined with small volume element body model. A whole body model consisting of 4 mm × 4 mm × 4 mm small volume elements was established by using a whole-body scanning image of the nuclear magnetic resonance by recognizing the tissues and organs and reusing the reference human data. The mannequin includes 23 radiation-sensitive organs and compresses the model data using look-up table techniques. Using the GEANT 4 M on teCarlo package, combined with this model, differential dose estimation spectra were calculated for the entrance of uni-protons to various tissues and organs. The space proton micro-injection and differential dose spectra were integrated to obtain the spatial radiation dose estimation. The skin equivalent dose of the solar proton event in August 1972 was estimated to be 9 256 cSv, which is close to the reference value of 9 350 cSv, which verifies the feasibility of the algorithm.