Kim S B, Stuart M, Bredlaw M, Festarini A, Beaton D
Atomic Energy of Canada Limited, Chalk River Laboratories, Ontario, Canada K0J 1J0.
Atomic Energy of Canada Limited, Chalk River Laboratories, Ontario, Canada K0J 1J0.
J Environ Radioact. 2014 Jun;132:73-80. doi: 10.1016/j.jenvrad.2014.02.001. Epub 2014 Feb 22.
The Canadian input parameters related to tritiated hydrogen gas (HT) used in tritium dose models are currently based on experiments performed at the Chalk River Laboratories (CRL) site in 1986, 1987 and 1994. There is uncertainty in how well other sites experiencing atmospheric HT releases are represented by these data. In order to address this uncertainty, HT to HTO conversion factors were evaluated at different locations near the Darlington Nuclear Power Generating Station (DNPGS) site using various experimental approaches. These were D2 gas exposure chamber experiments, atmospheric tritium measurements, and HTO and OBT measurements in vegetation and soil. In addition to these field experiments, chamber experiments were conducted using HT gas on field soil samples. The suggested Canadian input parameters for atmospheric tritium releases estimate the total fraction of HT oxidized in air and in soil, at the site, to be up to a maximum of 2.4%. Based on the more limited data obtained near DNPGS in early spring, this fraction would likely be closer to 0.5%. The result suggests that current parameters provide a conservative estimate for the DNPGS site.
目前，用于氚剂量模型的与氚化氢气（HT）相关的加拿大输入参数是基于1986年、1987年和1994年在乔克里弗实验室（CRL）场地进行的实验得出的。这些数据在多大程度上能代表其他经历大气HT释放的场地存在不确定性。为了解决这一不确定性，使用各种实验方法在达灵顿核电站（DNPGS）场地附近的不同位置评估了HT向HTO的转化因子。这些方法包括D2气体暴露室实验、大气氚测量以及植被和土壤中HTO和OBT的测量。除了这些现场实验外，还使用HT气体对田间土壤样品进行了室实验。建议的加拿大大气氚释放输入参数估计，该场地空气中和土壤中HT氧化的总比例最高可达2.4%。根据早春在DNPGS附近获得的更有限的数据，这一比例可能更接近0.5%。结果表明，当前参数为DNPGS场地提供了保守估计。
