大气氚释放剂量评价参数灵敏度分析

摘要/Abstract

摘要： 国内外目前对于大气氚释放剂量的评价多采用比活度模型,模型选取参数的不确定性会造成剂量评价结果的差异。考虑不同场址环境参数的差异性,对大气氚剂量评价模型中关键参数进行灵敏度分析与剂量评价结果的不确定性分析。结果显示场址环境空气湿度对大气氚的剂量评价结果影响最大,随着场址湿度的升高,大气氚排放所致食入内照射剂量逐渐降低,剂量计算结果不确定性逐渐降低。同时,研究表明在低湿度场址环境下,应重点关注土壤中HTO留存比例经验常数的测量与选取,在高湿度场址环境下,应重点关注作物水当量因子以及摄入HTO活度浓度在吸收水分氚中所占比例的测量与选取,以尽可能降低剂量评价结果的不确定性。

关键词: 氚, 评价, 参数灵敏度分析

Abstract: Currently, specific activity model is used to assess the dose due to atmospheric tritium release, and the uncertainty of the selected model parameters will cause variability of the dose assessment results. Considering the differences in environmental parameters of different sites, the key parameters in the atmospheric tritium dose assessment model that are affected by the site were analyzed for sensitivity and uncertainty of the dose assessment results. The results show that the humidity of the ambient air at the site has the greatest influence on the dose evaluation results of atmospheric tritium. As the humidity of the site rises, the ingestion internal dose due to atmospheric tritium discharge decreases, and the uncertainty of the dose calculation results also decreases. It was also shown that at low humidity site, the focus should be on the measurement and selection of empirical constants for the proportion of HTO retained in the soil. At high humidity plant site, the focus should be on the measurement and selection of the crop water equivalent factor and the concentration ratios for HTO intake. Thus, the uncertainty of the dose assessment results should be minimized.

Key words: tritium, evaluation, parameter sensitivity analysis

中图分类号:

TL75

杨洁, 岳琪, 顾志杰, 廉冰, 王彦. 大气氚释放剂量评价参数灵敏度分析[J]. 辐射防护, 2024, 44(3): 257-264.

YANG Jie, YUE Qi, GU Zhijie, LIAN Bing, WANG Yan. Sensitivity analysis of assessment parameters for dose calculations due to atmospheric tritium discharge[J]. RADIATION PROTECTION, 2024, 44(3): 257-264.

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