# Isotopes and Radioactive Decay

The isotope C14 has a half-life of 5700 years. What fraction of the C14 atoms will decay (a) each year, and (b) each minute?

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...alf-life" and "decay constant".

The "half-life" (or t1/2) of a radioactive isotope is defined as the time that is required for one half of the original number of atoms to decay. The half-life of an isotope is defined by the following equation:

The "decay constant" (l) is a constant-the decay constant for each isotope has a different value. The relationship between ...