The slope this line corresponds a biological half life days with standard deviations. Based alternatively upon k content, the zn attenuation fitted essentially the same rate over the year, having a half life. In addition the concentration decrease due biological processes, zn lost clue radioactive decay, decreasing exponentially at the rate half per days. The equation governing this process the same as that assumed for the biological turnover, a a, where the radioactive decay constant and related the radioactive half life t log t.

The biological and radioactive decay constants are additive, and together yield a loss rate called the effective half life, which describes the actual rate at which the zn concentration would decrease in these mussels growing in an environment free this radionuclide. In our case, combination biological and radioactive half lives days, respectively, gives an effective half life. In figure, a dashed line corresponding a day biological half life has been added emphasize that the concentration in shells decreased slower than this rate during the first days and possibly during the last weeks the test. Scattering measurements in soft tissues was much greater than attributable the counting fluctuation. Standard deviation the mean argumentative essay helper concentrations in the five initial samples, and for the entire five samples collected day.

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