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Activity Concentration (mB q g -1)Mean Activity Concentrations of 3 Th Isotopes in Sediment Samples from 3 Regional Reservoirs

                                                                    Brantley            Red Bluff            Lake
                                                                        Lake              Reservoir        Carlsbad

Figure 30.  Mean Activity Concentrations of Three Th Isotopes
in Sediment Samples from Three Regional Reservoirs
Error bars represent the 95% confidence interval for the mean.