Department of Radioecology, Institute for Environmental Sciences, 1-7 Rokkasho, Aomori, 039-3212, Japan.
National Institute for Fusion Science, 322-6, Toki, Gifu, 509-5292, Japan.
Environ Monit Assess. 2019 Jan 11;191(2):61. doi: 10.1007/s10661-019-7211-z.
Concentrations of iodine-129 (I) and atomic ratios of I/I in livestock (grass and milk), agricultural (cabbage, Japanese radish, and rice), and fishery (flatfish and brown alga) products collected from locations around the first Japanese commercial spent nuclear fuel reprocessing plant in Rokkasho were measured from 2006 to 2016. The actual spent nuclear fuel rods were cut and processed to test the functioning of the plant that discharged controlled amounts of I to the atmosphere and coastal seawater during the period from 2006 to 2008 (the "cutting period"). Statistically significant increases in I concentration and I/I ratio were observed during the cutting period in livestock products and flatfish. On the other hand, these parameters were statistically comparable during and after the cutting period in the other products. The radiation dose through the ingestion of the maximum I concentrations, measured in the different products, was estimated to be in the nanoSievert per year level. This value is much smaller than 1 mSv yr, which is the permissible authentic radiation dose for the general public. The I levels in the samples, especially in milk and flatfish, are discussed in context of the I discharge history from the plant.
从 2006 年到 2016 年，在日本第一座商业后处理核燃料再处理厂周围的地点收集了牲畜（草和牛奶）、农业（白菜、萝卜和大米）和渔业（比目鱼和褐藻）产品中的碘-129（I）浓度和 I/I 的原子比。实际的乏核燃料棒被切割和加工，以测试该工厂的运行情况，该工厂在 2006 年至 2008 年期间（“切割期”）将受控数量的 I 排放到大气和沿海水域中。在切割期间，牲畜产品和比目鱼中的 I 浓度和 I/I 比值显著增加。另一方面，在切割期间和之后，其他产品中的这些参数在统计学上是可比的。通过摄入不同产品中测量到的最大 I 浓度，估计辐射剂量为每年纳西沃特水平。该值远小于 1 mSv yr，这是公众允许的实际辐射剂量。本文还根据工厂的 I 排放量历史讨论了样品中的 I 水平，特别是牛奶和比目鱼中的 I 水平。
