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parent isotope

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Decay chain
In nuclear science, the decay chain refers to the radioactive decay of different discrete radioactive decay products as a chained series of transformations. They are also known as "radioactive cascades". Most radioisotopes do not decay directly to a stable state, but rather undergo a series of decays until eventually a stable isotope is reached.

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parent isotope
A radioactive isotope that changes into a different isotope when its nucleus decays. See also daughter isotope.

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