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The decay of radioactive elements occurs at a fixed rate. The half-life of a radioisotope is the time required for one half of the amount of unstable material to degrade into a more stable material. For example, a source will have an intensity of 100% when new. At one half-life, its intensity will be cut to 50% of the original intensity.
How many will remain after two half-lives (60 seconds)? Threehalf-lives? Use the Gizmo to check your answers.c.The half-life of a radioactive isotope is defined as the amount of time it takesfor half of the radioactive particles to decay. Start with 128 particles and ahalf-life of 30 seconds.