“…Zhou et al measured polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in sediment cores obtained from Xiangxi River, a tributary of the Three Gorges, using 137 Cs and 210 Pb radionuclides. They found higher concentrations of PCDDs and PCDFs in 1960–1990 compared with those in other years, confirming remarkable differences in each sediment layer [ 10 ]. Current studies primarily focus on dating sediment cores in shallow lakes and rivers and analysing the corresponding typical pollutant concentration and distribution.…”