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C oncen tra t ions and distr ibutions are reported for 239 + 240Pu, 238Pu an d 241Am in M y tilu s ed u lis L., Fucus ves icu losus L. a n d surface sed im en t from the Esk estuary C um bria UK, w hich is sub jec ted to e ffluents from the British N u c lea r Fuel Ltd u ran iu m reprocessing p lan t a t W indscale, C um bria . For M. edulis, da ta w as ob ta in ed on total soft t issues, shell an d for 11 organs a n d tissues. T he d is tr ibution of a lp h a particle activity for th in sections of the m usse ls w as ob ta in ed by a u to rad io g rap h y us ing a n e w therm oset die lectr ic de tector CR-39. E v idence is p re sen te d w hich ind ica tes tha t u p tak e of t ran su ran iu m rad io n u c lid e s is p robab ly from seaw ate r ra th e r th an from ing es ted sediment. Pu und Am re ta in ed w ith in the in test inal tract is e xcre ted in faeces; that w hich en te rs the systemic c ircula t ion g ives rise to a diffuse distribution. No significant en r ich m en t of Pu a n d Am occurs in k idney granules , b u t in the pe r icard ia l g lan d as a result of ultrafiltration processes localised e n h a n c e d levels of a lpha radioactivity w e re observed. H ighes t en r ich m en t of Pu a n d Am occurs in byssal th reads a n d periostracum, lowest in the shell w h e n the per ios tracum has b e e n removed. A lpha particle d istr ibution for byssal th reads a n d pe r ios tracum is diffuse, hot-spots are ab sen t a n d hence u p tak e is p robab ly direct form conservative species p re sen t in the seaw ate r . In situ d ialysis s tud ies in surface silty sed im en ts of the a rea provide ev idence of conservative species for both Pu an d Am. Differences in concen tra t ion of Pu and Am for 1977, 1978 and 1979 are described; in 1979 there was an increase in levels of Pu in the m usse l and sed im ent . F. vesicu losus con ta ined more Pu than Am. However, the Arn/Pu ratio for F. ves icu lo su s is s im ila r to that in byssal th read s of M. edulis.

marine ecology. progress series

Concentration and Distribution of the Transuranium Radionuclides 239 + 240Pu, 238Pu and 241Am in Mytilus edulis, Fucus vesiculosus and Surface Sediment of Esk Estuary