i ne 27 the average concentration in solution in the water column can be accounted for by using a simple equilibrium model in which remob Lization involves the sediment in the top 2.5 cm (Noshkin 1980). 5.4 Comparisons with Other Locations It is useful to compare the situation at Enewetak with other ocations there plutonium has been released to the marine environment One of the most studied locations is at Windscale in the United Kingdb where authorized radioactive discharges are made to the Irish Seaj from a nuclear fuel reprocessing plant. Since 1972 discharges of plutbnium isotopes to the coastal waters have averaged about 100 Ci per mo (ten times that in the dome). Since the first operations of the about 10,000 Ci of 73*****py have been discharged, 9,000 of whic ton et al. 1975, Penreath et al. 1979). Measurements have shown that the discharged plutonium is rapi removed to the sediments and that only a few percent of the inve (ag at Enewetak) remains in the water column. Within 10 km of thi source, concentrations in the water column average about 0.7 pci and concentrations in the sediments average about 40 pCi/g (dry) values as high as 105 pCci/g (dry) (Hetherington et al. 1975). : average concentrations exceed those at Enewetak, which are about P.017 pci/t for lagoon water and 5.2 pCi/g for lagoon sediments (Noshk et al.1980). Low leveld” of plutonium are discharged into Bombay harbor fra a nuclear facility at Trombay. Here plutonium concentrations in the vicinity of the discharge point range from 0.004 to 0.02 pci/z i seawater and from 0.4 to 29 pci/g in the suspended silt (Pillai a al. 1975, Pillai and Mathew 1976). A reprocessing plant at Tokai, Japa discharges into the ocean where activity levels of 7°%7?**pu as high as 0.017 pci/t have been reported offshore (Kurabayashi et a 1979). Thus, authorized releases i: different parts of the world hav produced concentrations of transuranics in the marine environment comparable to or in excess of those found at Enewetak. 5.5 Transuranics in Marine Foods Transuranics can be detected in marine organisms worldwide, salt and fresh water, due to global fallout from bomb tests. As be expected, relatively high concentrations in marine organisms @ found where there have been releases of transuranics (e.9., near Enewetak, Bikini, Windscale, Bombay, or Tokai). Concentration factors in fish (i.e., the ratio of activity i gram of fish to that in a gram of seawater from the same environme vary considerably between species and between samples of the same species taken from different locations. Among fish there ia lit evidence of any strong or consistent relation to trophic level. issues, as well as the results of measurements taken on 4,200 fis 14 atolls in the Marshalls, were summarized recently by Noshkin a co-workers (Noshkin et al. 1980). ‘They found concentration factdrs at Bikini and Enewetak to be similar, ranging from 5 to 10 in the mus tissue of fish at all trophic levels (2nd to 5th). Mean concentzmations at Enewetak in the muscle tissue of mullet and surgeonfish (which! are