Quantitative prediction of dynamic HTO migration behavior in the soil and non-negligible evapotranspiration effect
Quantitative prediction of dynamic HTO migration behavior in the soil and non-negligible evapotranspiration effect
复制标题
土壤中动态 HTO 迁移行为和不可忽略的蒸散效应的定量预测
DOI：
10.1016/j.jhazmat.2021.127772
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发表时间：
2022
影响因子：
13.6
通讯作者：
Dezhong Wang
中科院分区：
文献类型：
--
作者：
Baojie Nie;Siyuan Wu;Derui Yang;Deyi Chen;Weiguo Gu;Wentao Zhou;Junlian Yin;Dezhong Wang
除了核试验外，氚主要来自核设施。氚释放到环境中后，由于其放射性和流动性，会造成水和食物的污染。根据实际环境条件，研究了氚水在土壤中迁移的动态特征和蒸散效应。重点讨论了土壤类型以及降水量、蒸散量等时变环境因子对氚在正常、连续和偶然短期释放条件下迁移行为的影响。估算了动态氚蒸散引起的辐射剂量。结果表明，氚在土壤中的迁移速度远高于铯等其他粒子，这是因为土壤对氚的吸附可以忽略不计。氚在土壤中自上而下的迁移归因于降水。相反，蒸散因子会使氚沿相反的方向移动。在土壤中沉积的氚中，有相当一部分约55%将由于蒸散效应从裸露的土壤和植物叶片重新排放到空气中。随后，由于蒸散效应而产生的第二股羽流所产生的辐射剂量可能高于第一股羽流，这是因为在常规排放情况下从核设施直接释放的。
Tritium is mainly produced from nuclear facilities apart from nuclear tests. After being released to the environment, tritium would cause water & food contamination due to its radioactivity and mobility. This study investigated dynamic characteristics of tritiated water (HTO) migration in the soil and evapotranspiration effect based on realistic environmental conditions. The influences of soil types and time-varying environmental factors such as precipitation and evapotranspiration on tritium migration behaviors were specially discussed under normal continuous and accidental short-term release conditions. Radiation dose caused by dynamic tritium evapotranspiration was evaluated. The results show that tritium migration velocity in the soil is much higher than other particles such as cesium due to negligible adsorption of tritium by the soil. Tritium migration in the soil from up to down is attributed to precipitation. On the contrary, evapotranspiration factor would carry tritium movement along the opposite direction. A considerable fraction approximately 55% of tritium deposited in the soil would be reemitted into the air from bare soil and plant leaves due to evapotranspiration effect. Subsequently, the radiation dose caused by second plume due to evapotranspiration effect might be higher than the first plume due to direct release from the nuclear facility under routine discharge.