The half-life is the time period over which half the nuclei of a given radionuclide decay. The half-life, depending on the radionuclide considered, varies from billions of years (i.e. U238 has a half-life of 4.468 x 109 years) down to small fractions of
seconds (i.e. Po has 164 microseconds). An example may help: Pb has a half life of 26.8 min, and this means that if there are N nuclei of Pb214 at time zero, after 26.8 minutes there will be N/2 nuclei (the other N/2 have become Bi214 because of beta decay), after 53.6 minutes there will be N/4 nuclei of Pb214 (3/4N have become Bi214) and so on.
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.