- Fish 13 - 9 2 2 The average concentration o £ 241an and 39,240 Pu is 0.11 and 0.25 pCi/g respectively (Ref. 1). 241 was non-detected in most fish samples and the value 0.11 pCi/g represents the value obtained when the detection limit is assumed to be a real concentration. using 1.85 as the ~“!pu to 2399740 Pu 1.85 (0.25) = 0.46 pCi/g ratio the 241 Again . Pu concentration is 2415 The maximum PATay which can grow in from this level of 24104 is 0.46 (0,026) = 0.012 pCi/g. Relative to the present 241an concentrations of 0.11 pCi/g this represents an 11% increase, The total 241 Am will be ,240,, O.11 + 0.012 = 0.122 pCi/g; compared with the 239 u of 0.25 pCi/g this is 0,122/0.25 = 0.49 or 49% of the 239,240 Pu levels. However, a more realistic situation is that the fish will always reflect the same ratio of water concentrations. 2h1 Am t 5 2392240 Pu as they do to the present Therefore, the increased resulting from "grow in" from 24.4 will lead to in fish which are 64% of the 239,240 241 2 : Am water concentrations #1 concentrations Pu concentrations. Sediment Concentrations and Ratios The ratio of 24a to 239,240, u in lagoon sediments is 0.37 and for the craters is 0,29 (Ref. 1). These data will be shown to correspond very well with ratios observed,in the soil. The 24d and 239,240), concentrations are 172 and 463 mCi/Km2 respectively. The 241bu concentration is therefore 1.85 (463) = 857 mCi/Km2. The maximun 241 Pu is therefore 0.026 (857) - 22 mCi/km?, This 241an activity from will be a 13% increase above present levels of 172 mCi/Km?. The total 241am activity will be 172 + 22 = 194 mCi/Km? which 194/463 = 0.42 or 42% of the 2392405, activity.