Department of Radioecology, Institute for Environmental Sciences, 1-7 Rokkasho, Aomori 039-3212, Japan.
Radiat Prot Dosimetry. 2022 Sep 9;198(13-15):957-963. doi: 10.1093/rpd/ncac019.
Between April 2006 and October 2008, tritium ( 3H) and iodine-129 ( 129I) were released into the atmosphere and ocean from a spent nuclear fuel reprocessing plant in Rokkasho, Japan. From 2005 to 2020, water samples were collected from water bodies around the plant, including a river, groundwater wells, a brackish lake, a fishing port and a coastal sea, to measure spatiotemporal changes in 3H and 129I concentrations. Water samples from the brackish lake and the fishing port between 2006 and 2008 occasionally had higher than background levels of 3H and 129I. Batched discharge of waste 3H and 129I was quickly diluted by advection-diffusion processes in the coastal sea, causing 3H and 129I from the plant to be indetectable. By contrast, concentrations of 3H and 129I that flowed into the brackish lake and the fishing port through various routes were high, as these water bodies are mostly closed systems.
2006 年 4 月至 2008 年 10 月，日本六所村核燃料再处理厂向大气和海洋中释放了氚（3H）和碘-129（129I）。2005 年至 2020 年期间，从该厂周围的水体中采集了水样，包括一条河流、地下水井、一个半咸水湖、一个渔港和一个沿海水域，以测量 3H 和 129I 浓度的时空变化。2006 年至 2008 年间，半咸水湖和渔港的水样中偶尔会出现高于背景水平的 3H 和 129I。批量排放的废氚和碘-129 很快通过沿海海域的平流-扩散过程被稀释，导致工厂的 3H 和 129I 无法检测到。相比之下，通过各种途径流入半咸水湖和渔港的 3H 和 129I 浓度很高，因为这些水体大多是封闭系统。
