![]() Why do we use the term like half-life rather than lifetime? The answer can be found by examining Figure 22.24, which shows how the number of radioactive nuclei in a sample decreases with time. Here we will explore half-life and activity, the quantitative terms for lifetime and rate of decay. ![]() That means they have shorter lifetimes, producing a greater rate of decay. ![]() ![]() For example, radium and polonium, discovered by Marie and Pierre Curie, decay faster than uranium. However, some nuclides decay faster than others. Half-Life and the Rate of Radioactive Decay
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