Half life symbol7/3/2023 ![]() It is now used in many other situations where something declines exponentially, like the time it takes for a drug in the body to be half gone. The word "half-life" was first used when talking about radioactive elements where the number of atoms get smaller over time by changing into different atoms. The half-life of a substance is the time it takes for half of the substance to decay. ![]() Note the law of large numbers: With more atoms, the overall decay is more regular and more predictable. ![]() The number at the top is how many half-lives have elapsed. Simulation of many identical atoms undergoing radioactive decay, starting with either 4 atoms per box (left) or 400 (right).
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