Where A Activity after some time t A o Original activity of the sample t Decay time λ the radioactive decay constant equal to The halflife equation can be also used for activity simply by replacing the number of atoms ID: 1025981
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1. Since radioactive material is measured in units of activity, the decay equation now takes the form:Where: A = Activity after some time t.Ao = Original activity of the sample.t = Decay time λ = the radioactive decay constant equal to
2. The half-life equation can be also used for activity, simply by replacing the number of atoms N and N0 with the activities A and A0. It should be mentioned that the International System (SI) of units has defined the becquerel (Bq) as the unit of activity, equal to 1disintegration per second. Thus: 1 Ci = 3.7 x 1010 Bq.
3. Radioactive datingCarbon-14 has a half life of 5730 years. Once a plant or animal dies its carbon-14 content gradually decreases. Using the half life for carbon-14 and comparing the amount of carbon-14 in on ancient artifact with the amount of carbon-14 we would expect in a fresh sample today we can date an object.