Atomic and Nuclear PhysicsDOE-HDBK-1019/1-93RADIOACTIVITYRev. 0Page 37NP-01Figure 11 Linear and Semi-log Plots of Nitrogen-16 DecayPlotting the data points calculated above on both linear and semilog scales results in the graphsshown in Figure 11.If a substance contains more than one radioactive nuclide, the total activity is the sum of theindividual activities of each nuclide. As an example, consider a sample of material thatcontained 1 x 10 atoms of iron-59 that has a half-life of 44.51 days ( = 1.80 x 10 sec ),6-7 -11 x 10 atoms of manganese-54 that has a half-life of 312.2 days ( = 2.57 x 10 sec ), and 16-8 -1x 10 atoms of cobalt-60 that has a half-life of 1925 days ( = 4.17 x 10 sec ). 6-9 -1The initial activity of each of the nuclides would be the product of the number of atoms and thedecay constant.
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