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Radioactive decay is a statistical process that depends on the instability of the particular radioisotope. For two successive decay processes, total activity (or number of disintegrations per second) is given by the green curve for ... : ... , where ... and ... are the decay constants for the two radioactive components (unstable nuclei or isotopes) and ... is the total number of nuclei at time ... . For example, if the first component is ... , with a half-life of 19.7 minutes and the second component is ... , with a half-life of 26 minutes, the decay constants are ... and ... , respectively. In this Demonstration we use the relative values of radioactive constants with the "range without intersection". The blue curve represents the second (or daughter) isotope ... : ... .

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