For a selected atom in a sample of a radioactively decaying isotope,the probability that it will decay during a time interval of a specified length is

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The probability that a selected atom in a sample of a radioactively decaying isotope will decay during a specific time interval is independent of when the time interval starts relative to the current time. This probability is determined by the decay constant of the isotope which is constant over time and does not depend on the age of the atom or when the time interval starts.

For a Selected Atom in a Sample of a Radioactively