Glossary - D

Decay (Radioactive)

The change of one radioactive nuclide into a different nuclide by the spontaneous emission of alpha, beta, or gamma radiation, or by electron capture. The end product is a less energetic, more stable nucleus. Each decay process has a definite half-life.

Source: AECL

Decontamination

The removal of radioactive contaminants by cleaning and washing with water and/or chemicals.

Source: AECL

Deuterium

A stable, naturally-occurring hydrogen isotope. It is used as a moderator in the form of deuterium oxide or heavy water.

Source: AECL

Dose

A general term denoting the quantity of radiation or energy absorbed in a specific mass.

Source: AECL