Parent

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Parent

</dt>
A radionuclide that upon disintegration yields a specified nuclide, the daughter, either directly or as a later member of a radioactive series. </dd>
Thus, U²³⁸ is the parent of all members of the uranium series, including the end product, Pb²⁰⁶. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use