State Research Institute Center for Physical Sciences and Technology, Vilnius, Lithuania.
State Research Institute Nature Research Centre, Vilnius, Lithuania.
PLoS One. 2023 Oct 20;18(10):e0285531. doi: 10.1371/journal.pone.0285531. eCollection 2023.
The vertical distribution of radiocarbon (14C) was examined in two bottom sediment cores, taken from Lake Drūkšiai which had been used as a cooling pond for the Ignalina nuclear power plant (INPP) with two RBMK type reactors. The aim of this work was to reconstruct 14C amounts in the lake ecosystem during an 8-year period after the INPP was closed, as any official monitoring of 14C in liquid releases from the INPP was not performed. The possibility of comparing the variation of the 14C specific activity in the corresponding layers of the same period of 3 different cores (one taken in 2013 and two in 2019) revealed the variability of the determined values of liquid radiocarbon discharges from the INPP into the lake. Cores taken in 2019 showed a permament14C release rate of 0.76±0.06 GBq/y all eight years after the closure of the INPP. The 14C release rate established from radiocarbon measurements in both cores did not differ by more than 0.8 GBq/y. However, including data from the core taken several years ago, the estimated radiocarbon release rate values varied within 1.3 GBq/y.
研究了取自 Drūkšiai 湖的两个底泥岩芯中放射性碳 (14C) 的垂直分布情况，该湖曾被用作 Ignalina 核电站（INPP）的冷却池，其中有两个 RBMK 型反应堆。这项工作的目的是在 INPP 关闭后的 8 年内重建湖泊生态系统中的 14C 含量，因为 INPP 没有对液体排放中的 14C 进行任何官方监测。比较同一时期的 3 个岩芯（一个取自 2013 年，两个取自 2019 年）对应层的 14C 比活度变化的可能性，揭示了从 INPP 排入湖泊的液体放射性碳排放量确定值的可变性。2019 年采集的岩芯在 INPP 关闭后的八年中，放射性碳的释放率始终为 0.76±0.06GBq/y。从两个岩芯中的放射性碳测量得出的 14C 释放率差异不超过 0.8GBq/y。然而，包括来自几年前采集的岩芯的数据，估计的放射性碳释放率值在 1.3GBq/y 内变化。
