![]() The time in which half of the original number of nuclei decay is defined as the half-life, t 1 / 2 size 12Ĭan be found in Appendix B, and was stated above as 5730 y. Why use a term like half-life rather than lifetime? The answer can be found by examining, which shows how the number of radioactive nuclei in a sample decreases with time. ![]() In this section we explore half-life and activity, the quantitative terms for lifetime and rate of decay. This means they have shorter lifetimes, producing a greater rate of decay. ![]() For example, radium and polonium, discovered by the Curies, decay faster than uranium. However, some nuclides decay faster than others. Be sure to discuss whether the formula is valid for the case described.
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