Artificial radionuclides 90Sr and 241Am in the sediments of the Baltic Sea: Total and spatial inventories and some temporal trends

•The inventories of 137Sr and 241Am in the Baltic Sea is studied.•About 20 sediment cores around the Baltic Sea were analyzed.•The results show that 90Sr distribution is uneven and effected by the Chernobyl fallout.•241Am is more evenly distributed in the sediments.•The Baltic Sea is the most contaminated sea with respect to 137Cs in sediments.