Measurements of Tc-99, Cs-137, Np-237, Pu isotopes and Am-241 in sediment cores from intertidal coastal and estuarine regions in the Irish Sea

Long-lived radionuclides, Tc-99, Cs-137, Np-237, Pu isotopes and Am-241 wer e determined in the long sediment cores collected from nine intertidal site s around the west Cumbria of the Irish Sea, UK. The inventories of an nucli des measured varied considerably among the sampling sites, but generally th eir inventories decreased with increasing distance from Sellafield. Further more, the inventory ratios with respect to relationship with distance from Sellafield enabled comparison of transport behavior of Tc-99, Cs-137, Np-23 7 and Am-241 compared with Pu-239,Pu-240. AS a consequence, the apparent fr actional rate of solution transport to the intertidal sediment was found to increase as follows: Tc-99>Cs-137>Np-237>Pu-239,Pu-240 greater than or equ al to(241)Am.