t_{1/2}0.6930.693t_{1/2}0.6937.13 seconds0.0972 second^{1}AA_{o} etRADIOACTIVITYDOE-HDBK-1019/1-93 Atomic and Nuclear PhysicsNP-01Page 36Rev. 0Example:Plot the radioactive decay curve for nitrogen-16 over a period of 100 seconds. Theinitial activity is 142 curies and the half-life of nitrogen-16 is 7.13 seconds. Plot thecurve on both linear rectangular coordinates and on a semi-log scale.Solution:First, use Equation (1-6) to calculate the decay constant corresponding to a half-life of7.13 seconds.Use the decay constant determined above to calculate the activity at various times usingEquation (1-5).TimeActivity0 seconds142 Ci20 seconds20.3 Ci40 seconds2.91 Ci60 seconds0.416 Ci80 seconds0.0596 Ci100 seconds0.00853 Ci

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