External radiation doses from 137Cs to frog phantoms in a wetland area: in situ measurements and dose model calculations
External radiation doses from 137Cs to frog phantoms in a wetland area: in situ measurements and dose model calculations
复制标题
137Cs对湿地青蛙体模的外部辐射剂量：原位测量和剂量模型计算
DOI：
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发表时间：
2008
影响因子：
1.7
通讯作者：
H. Pettersson
中科院分区：
文献类型：
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作者：
K. Stark;H. Pettersson
为评估137 Cs污染湿地青蛙的外照射剂量，用聚甲基丙烯酸甲酯（PMMA）构建青蛙模型。青蛙幻影含有热释光（TL）芯片，并在两个研究地点原位使用，以测量剂量。为了测试青蛙的敏感皮肤是否接受了更高的剂量，将超薄TL芯片施加到青蛙幻影的表面附近。此外，将测量的剂量与根据湿地土壤样本数据乘以美国能源部RESRAD-BIOTA代码和埃里卡评估工具的剂量转换系数计算的剂量进行了比较。测得的剂量一般低于对用于青蛙模型的椭圆体计算的剂量。与两个部位中的一个部位的内部相比，在青蛙幻影的表面测量到更高的剂量，这表明青蛙的薄皮肤可以接受比预期更高的辐射剂量。在确保保护非人类生物群的努力中，用放射性核素进行的现场测量为放射性核素污染地区特定地点风险评估的剂量模型提供了宝贵的剂量信息和投入。
For assessment of external radiation doses to frogs in a wetland area contaminated with 137Cs, frog phantoms were constructed from polymethyl methacrylate (PMMA). The frog phantoms contained thermoluminescence (TL) chips and were used in situ at two study sites to measure doses. To test if higher doses are received by the sensitive skin of frogs, extra-thin TL chips were applied close to the surface of the frog phantoms. In addition, the measured doses were compared with those calculated on the basis of soil sample data from the wetland multiplied with dose-conversion coefficients from the US Department of Energy’s RESRAD-BIOTA code and from the ERICA assessment tool. Measured doses were generally lower than those calculated to ellipsoids used to model frogs. Higher doses were measured at the frog phantoms’ surfaces in comparison to inner parts at one of the two sites indicating that the frogs’ thin skin could receive a higher radiation dose than expected. In the efforts to assure protection of non-human biota, in situ measurements with phantoms provide valuable dose information and input to dose models in site-specific risk assessments of areas contaminated with radionuclides.