Linnik V G, Brown J E, Dowdall M, Potapov V N, Surkov V V, Korobova E M, Volosov A G, Vakulovsky S M, Tertyshnik E G
Vernadsky Institute of Geochemistry and Analytical Chemistry, Kosygin Street 19, 117975, Moscow, Russia.
Sci Total Environ. 2005 Mar 1;339(1-3):233-51. doi: 10.1016/j.scitotenv.2004.07.033.
The radioactive contamination of a riverine floodplain, heavily influenced by discharges from Krasnoyarsk-26, has been studied with respect to sedimentation processes and the geomorphology of the Upper Yenisey floodplain. The study was effected by implementation of a regime of in situ observations and measurements, sampling, and the interpretation of satellite images. The results of the study indicate that on the Balchug Bypass Floodplain, radionuclide contamination is primarily influenced by the thickness of the deposited sediments, and the area can be considered as two depositional environments. The Balchug floodplain area was contaminated due to sedimentation of radionuclide-contaminated alluvium, whose depositional regime significantly changed after the construction of a hydroelectric power station in 1967. Contamination levels are lower on the upstream part of the floodplain where sediment depth is less than 0.2-0.3 m, and this contamination started to accumulate in 1967, while the downstream part of the floodplain, exhibiting deeper deposits, displays higher levels of radionuclide contamination because radionuclides began to deposit here in 1958 when the Krasnoyarsk-26 Mining and Chemical Combine (KMCC) commenced operation. Radionuclide contamination of the floodplain is also related to the elevation of the floodplain, higher regions of the floodplain typically having lower contamination than low-lying areas, which tend to be frequently inundated with sediments being deposited during such inundations. Local relief, its orientation, and vegetation cover have also combined to form sediment traps with significantly higher radionuclide contamination. Lithological analysis combined with radiometric assay indicates a total 137Cs floodplain inventory of 33.7 GBq.
受克拉斯诺亚尔斯克-26排放物严重影响的河漫滩放射性污染，已针对叶尼塞河上游河漫滩的沉积过程和地貌进行了研究。该研究通过实施现场观测与测量、采样以及卫星图像解读等方法得以开展。研究结果表明，在巴尔丘格分流河漫滩，放射性核素污染主要受沉积泥沙厚度的影响，该区域可被视为两种沉积环境。巴尔丘格河漫滩区域因放射性核素污染冲积物的沉积而受到污染，1967年一座水电站建成后，其沉积状态发生了显著变化。河漫滩上游部分的污染水平较低，那里的泥沙深度小于0.2 - 0.3米，这种污染始于1967年；而河漫滩下游部分沉积物更深，放射性核素污染水平更高，因为1958年克拉斯诺亚尔斯克-26采矿与化学联合企业（KMCC）开始运营时，放射性核素就开始在此沉积。河漫滩的放射性核素污染还与河漫滩的海拔有关，河漫滩较高区域的污染通常低于低洼地区，低洼地区往往频繁被淹没，在此期间会有沉积物堆积。局部地形、其走向以及植被覆盖也共同形成了放射性核素污染显著更高的沉积物陷阱。岩性分析与放射性测定相结合表明，河漫滩的137Cs总量为33.7吉贝克勒尔。
