摘要
The English Channel(the Channel)represents a major sink and transport pathway of anthropogenic radioactive ^(129)I.Despite this important role,data concerning the distribution of ^(129)I in seawater of the Channel are scarce,and most of existing data are restricted to the eastern part of the Channel.The advection and dispersion of ^(129)I from the French coast toward the central and further the English coast,especially in the Channel west of Cap de La Hague,are not fully investigated.We present results of iodine isotopes( ^(127)I and ^(129)I)analyses of surface water samples collected along the central English Channel in October,2010.The data show high ^(129)I concentrations between Dover Strait and La Hague,followed by a dramatic drop towards the Celtic Sea and reveal the dispersal of ^(129)I towards central and northern part of the Channel.Our observation also implies that the entire British coast is contaminated by ^(129)I. ^(129)I levels in the westernmost English Channel,close to the English coast,may reflect combined influences from La Hague and Sellafield.Evolution of ^(129)I between 2005 and 2010 suggests a strong link to temporal marine discharges from La Hague plant.The discharges from the nuclear reprocessing facility have continued since 2010 and thus an ecological evaluation of ^(129)I radioactive hazards in the environment of the Channel may be needed.
基金
The National Natural Science Foundation of China under contract No.41603122
the Everest Scientific Research Program of Chengdu University of Technology under contract Nos 2020ZF11405 and 2021ZF11419
the Open Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection under contract No.SKLGP2019K013
the Open Fund of Sichuan Vanadium&Titanium Industry Development Research Center under contract No.2020VTCY-Z-01
the Fund of Science and Technology Department of Sichuan Province under contract No.2021JDTD0013
the Foundation for Young Backbone Teachers of Chengdu University of Technology,2022。
