![]() Thus, the probability of its breaking down does not increase with time, but stays constant no matter how long the nucleus has existed. A nucleus does not “age” with the passage of time. ![]() In other words, a nucleus of a radionuclide has no “memory”. As was written, radioactive decay is a random process at the level of single atoms, in that, according to quantum theory, it is impossible to predict when a particular atom will decay. The half-life is defined as the amount of time it takes for a given isotope to lose half of its radioactivity. One of the most useful terms for estimating how quickly a nuclide will decay is the radioactive half-life ( t 1/2).
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