The nuclide which produces by radioactive decay or nuclear reaction (e.g. in a generator) the daughter nuclide. The daughter nuclide becomes, if not stable, the unstable parent in the next decay.

See also Decay, Decay Chain and Generator.

The nuclide produced by radioactive decay or nuclear reaction (e.g. in a generator) of the parent nuclide. The daughter nuclide becomes, if not stable, the unstable parent in the next decay.

See also Decay, Decay Chain and Generator.

Decay chain or decay series is a series of decays that certain radioisotopes go through before reaching a stable form. For example, the production of technetium-99m (daughter nuclide with a half-life of 6 hours) from molybdenum-99 (parent nuclide with a half-life of 66 hours) in a generator is part of a decay chain.

See also Decay and Generator.

Thorium (232Th) is a naturally radioactive element. Thorium is the parent nuclide of one radioactive series, and specific thorium nuclides are decay products of three radionuclide series.

See also Thorotrast.