title: Artificial radionuclides ⁹⁰Sr and ²⁴¹Am in the sediments of the Baltic Sea: total and spatial inventories and some temporal trends.
abstract: The Baltic Sea was contaminated by radioactivity following global nuclear fallout and later by the Chernobyl accident. Despite the decrease of radioactivity caused by radioactive decay, radionuclides have a prolonged residence time in the water of the Baltic Sea due to slow water exchange and relatively rapid sedimentation. Very little is known about the amounts or spatial differences of ⁹⁰Sr and ²⁴¹Am in the Baltic Sea sediments. In this study, 20 sediment cores taken around the Baltic Sea were investigated to estimate inventories of these radionuclides. The rough results show that the Chernobyl fallout added the amount of ⁹⁰Sr in the same areas where the increase of ¹³⁷Cs can be detected, whereas this is not the case for ²⁴¹Am which is more evenly distributed in the sea bottom. In addition, local differences occur in the concentrations. These results are an important amendment to the radioactivity baseline of the Baltic Sea.
authors.affiliation: Radiation and Nuclear Safety Authority, P.O. Box 14, FIN-00881 Helsinki, Finland. kaisa-leena.hutri@stuk.fi
authors.forename: Kaisa-Leena
authors.initials: KL
authors.lastname: Hutri
authors.forename: Jukka
authors.initials: J
authors.lastname: Mattila
authors.forename: Tarja Tuulikki
authors.initials: TT
authors.lastname: Ikäheimonen
authors.forename: Vesa-Pekka
authors.initials: VP
authors.lastname: Vartti
mesh_terms: D000576:Americium / Q000032:analysis*; D019015:Geologic Sediments / Q000737:chemistry*; D011847:Radioactive Fallout / Q000032:analysis* / Q000706:statistics & numerical data; D012623:Seawater / Q000737:chemistry; D013326:Strontium Radioisotopes / Q000032:analysis*; D014875:Water Pollutants, Radioactive / Q000032:analysis*; D014878:Water Pollution, Radioactive / Q000706:statistics & numerical data*
chemical_list: D011847:Radioactive Fallout; D013326:Strontium Radioisotopes; D014875:Water Pollutants, Radioactive; D000576:Americium