Environmental Technologies Branch, Chalk River Laboratories, AECL, Chalk River, Ontario K0J1J0, Canada.
J Environ Radioact. 2012 Jan;103(1):34-40. doi: 10.1016/j.jenvrad.2011.08.013. Epub 2011 Sep 25.
Tritium is routinely released by the Chalk River Laboratories (CRL) nuclear facilities. Three International HT release experiments have been conducted at the CRL site in the past. The site has not been disturbed since the last historical atmospheric testing in 1994 and presents an opportunity to assess the retention of tritium in soil. This study is devoted to the measurement of HTO and OBT activity concentration profiles in the subsurface 25 cm of soil. In terms of soil HTO, there is no evidence from the past HT release experiments that HTO was retained. The HTO activity concentration in the soil pore water appears similar to concentrations found in background areas in Ontario. In contrast, OBT activity concentrations in soil at the same site were significantly higher than HTO activity concentrations in soil. Elevated OBT appears to reside in the top layer of the soil (0-5 cm). In addition, OBT activity concentrations in the top soil layer did not fluctuate much with season, again, quite in contrast with soil HTO. This result suggests that OBT activity concentrations retained the signature of the historical tritium releases.
氚在 chalk river 实验室（crl）核设施中被常规释放。过去在 crl 场址进行了三次国际氚释放实验。自 1994 年最后一次历史大气测试以来，该场址一直未受干扰，为评估氚在土壤中的滞留提供了机会。本研究致力于测量土壤中地下 25 厘米处的 hto 和 obt 活度浓度分布。就土壤中的 hto 而言，过去的氚释放实验没有证据表明 hto 被保留。土壤孔隙水中的 hto 活度浓度与安大略省背景地区发现的浓度相似。相比之下，同一地点土壤中的 obt 活度浓度明显高于土壤中的 hto 活度浓度。高浓度的 obt 似乎存在于土壤的顶层（0-5 厘米）。此外，顶层土壤中的 obt 活度浓度随季节变化不大，这与土壤中的 hto 形成鲜明对比。这一结果表明，obt 活度浓度保留了历史氚释放的特征。
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