A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Av., Sevastopol, 299011, Russian Federation.
J Environ Radioact. 2021 Apr;229-230:106540. doi: 10.1016/j.jenvrad.2021.106540. Epub 2021 Jan 24.
The new data on Pu, Pu, Pu, Am vertical distribution in the deep western Black Sea sediments was analyzed. The sediment dating, obtained by means of Pu/Pu activity ratio vertical distribution, suggested the upper 3 cm layer of sediments to be formed during 27 years after the Chernobyl accident and the deeper layers to be formed earlier in pre-Chernobyl time (before 1986). The whole data set on profiles of radionuclides studied was shown to reflect the history of their input into the basin and elimination of these radionuclides from the water column. Analysis of inventories of plutonium alpha-emitting nuclides ensured a more significant contribution of Chernobyl fallout into the present total Pu inventory than into Pu one. The Am inventory after-deposition enhancement due to Pu decay was estimated at 74% in pre-Chernobyl sediment layer and the general contribution of Pu support in the total Am inventory in situ enhancement was estimated at 49%.
对来自黑海西部深水区沉积物中 Pu、Pu、Pu 和 Am 的垂直分布的新数据进行了分析。利用 Pu/Pu 活度比的垂直分布对沉积物进行定年，结果表明，沉积物的上层 3 厘米形成于切尔诺贝利事故发生后的 27 年，而更深层的沉积物则形成于切尔诺贝利事故之前（1986 年之前）。研究中所有剖面的放射性核素数据集都反映了它们输入盆地的历史以及这些放射性核素从水柱中消除的历史。对钚α发射核素丰度的分析确保了切尔诺贝利沉降物对当前总 Pu 丰度的贡献比 Pu 丰度的贡献更为显著。由于 Pu 衰变，在切尔诺贝利事件前的沉积层中，Am 的沉积后增强估计为 74%，而 Pu 对总 Am 丰度的原位增强的总贡献估计为 49%。
