Dj. Assinder et al., RADIOISOTOPES OF 13 ELEMENTS IN INTERTIDAL COASTAL AND ESTUARINE SEDIMENTS IN THE IRISH SEA, Journal of radioanalytical and nuclear chemistry, 170(2), 1993, pp. 333-346
A survey has been carried out of K-40, Co-60, Tc-99, Ru-106, Sb-125, I
-129, Cs-134, Cs-137, Eu-154, Ra-226, Ra-228, Np-237, Pu-238, Pu-239,
Pu-240, Pu-241, Am-241, Cm-242, and Cm-243, Cm-244 activities in sedim
ents from the Irish Sea. Several of these radionuclides were measured
independently at two separate laboratories to enable the intercomparis
on of the results produced. The comprehensive data set generated allow
s the present spatial distributions of these radionuclides in coastal
sediments to be examined in relation to sediment textural characterist
ics and, by comparison with earlier surveys, enables the temporal tren
ds in their activities to be determined. In general all artificial rad
ionuclides showed lower activities in sediments in response to failing
discharges from Sellafield and relationships with either grain size,
distance from Sellafield or both. Isotope ratios were similar to cumul
ative weighted activity ratios rather than present day values due to s
ediment mixing. Pu levels supplied evidence for the lag in response of
sediment deposits with increasing distance from Sellafield due to sed
iment transport.