西北地区陆生典型昆虫剂量学模型的建立及应用  

Establishment and application of typical insect dose model in northwestern China

作　　者：贡文静 张晟 张超 李建国[1] Gong Wenjing;Zhang Sheng;Zhang Chao;Li Jianguo(China Institute for Radiation Protection,Taiyuan 030006,China)

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《中华放射医学与防护杂志》2021年第11期856-861,共6页Chinese Journal of Radiological Medicine and Protection

摘　　要：目的通过对西北地区某内陆厂址进行生态环境调查,选定厂址附近优势昆虫物种中华牛角螽(Damalacanthavaccasinica B.-Bienko)作为建立剂量学模型参考物种,将计算结果与电离辐射的环境危害:评价与管理(ERICA)软件计算结果进行比较,验证本次建立昆虫剂量学模型可行性。方法针对中华牛角螽,建立基于解剖学和几何学的简化解剖学模型和基于CT断层扫描获得中华牛角螽断层序列图像建立体素模型;结合蒙特卡罗粒子输运过程,得到放射性核素粒子在昆虫组织/器官中沉积能。根据经验公式,得到昆虫剂量系数(DCs),计算出^(90)Sr、^(137)Cs对中华牛角螽的剂量率。结果^(90)Sr、^(137)Cs对中华牛角螽简化解剖学模型整体平均内照射剂量率结果分别为8.58×10^(-2)、4.25×10^(-3)μGy/h;外照射剂量率结果分别为2.81×10^(-2)、2.56×10^(-1)μGy/h。^(90)Sr、^(137)Cs对中华牛角螽体素模型整体平均内照射剂量率结果分别为3.91×10^(-2)、2.91×10^(-3)μGy/h;外照射剂量率结果分别为1.18×10^(-2)、1.12×10^(-1)μGy/h。ERICA软件^(90)Sr、^(137)Cs对生物整体内照射剂量率结果分别为1.46×10^(-1)、1.46×10^(-2)μGy/h,外照射剂量率结果分别为5.79×10^(-2)、2.58×10^(-1)μGy/h。结论本次建立的昆虫剂量学模型计算结果与ERICA软件结果总体相当,证明本次建立的剂量学模型所得结果可靠。随着建立模型精确度提高,计算结果也更接近实际情况,说明本次建立的剂量学模型计算结果可信。Objective To validate the feasibility of establishing a dosimetric model for insect species by investigating the ecological environment of an inland site in the northwestern China.Methods For Damalacore,a simplified anatomical model based on anatomy and geometry and a model based on CT scan sequence image were established to produce a voxel model.In combination with the Monte Carlo particle transport process,the deposited energy of the radionuclides in the insect tissues/organs was obtained.The dose rate from ^(90)Sr and ^(137)Cs to Damalacore was calculated on the basis of empirical formula.Results The dose rate from internal exposure to the simplified anatomical model was 8.58×10^(-2)for ^(90)Sr and 4.25×10^(-3)μGy/h for ^(137)Cs,whereas the dose rate from external exposure to the simplified anatomy model was 2.81×10^(-2)for ^(90)Sr and 2.56×10^(-1)μGy/h for ^(137)Cs,respectively.The internal exposure to the voxel model from ^(90)Sr and ^(137)Cs was 3.91×10^(-2)and 2.91×10^(-3)μGy/h,whereas the external exposure to the voxel model from ^(90)Sr and ^(137)Cs was 2.81×10^(-2) and 2.56×10^(-1)μGy/h,respectively.The internal exposure from ^(90)Sr and ^(137)Cs to ERICA model was 1.46×10^(-1) and 1.46×10^(-2)μGy/h,whereas the external exposure to the ERICA model from ^(90)Sr and ^(137)Cs was 5.79×10^(-2) and 2.58×10^(-1)μGy/h,respectively.Conclusions The calculated results based on the two models are similar to those based on ERICA model and therefore are proved reliable.With improved model accuracy,the calculated result are more close to the practical situation and feasible.

关 键 词：中华牛角螽 简化解剖学模型 体素模型 剂量系数 剂量率 

分 类 号：R144.1[医药卫生—公共卫生与预防医学]