| Subject | English | French |
| el. | decay rate of a radioactive element | taux de désintégration nucléaire d'un élément radioactif |
| el. | disintegration rate of a radioactive element | taux de désintégration nucléaire d'un élément radioactif |
| nat.sc., phys.sc. | natural radioactive element | élément radioactif naturel |
| nat.sc., phys.sc. | natural radioactive element | radioélément naturel |
| radiat. | naturally occurring radioactive element | élément radioactif naturel |
| radiat. | naturally occurring radioactive element | radioélément naturel |
| radiat. | primordial radioactive element | radioélément primitif (natural, of half-life sufficiently long to exist since the formation of earth's crust) |
| radiat. | primordial radioactive element | radioélément primordial (natural, of half-life sufficiently long to exist since the formation of earth's crust) |
| radiat. | primordial radioactive element | élément radioactif primitif (natural, of half-life sufficiently long to exist since the formation of earth's crust) |
| radiat. | primordial radioactive element | élément radioactif primordial (natural, of half-life sufficiently long to exist since the formation of earth's crust) |
| med., chem. | radioactive element | radioélément |
| polit. | radioactive element | élément radioactif |
| nucl.phys., radiat. | radioactive element | radioélément (a chemical element, not a nuclide) |
| radiat. | radioactive element | élément radioactif (a chemical element, not a nuclide) |
| radiat. | radioactive element | élément chimique radioactif (a chemical element, not a nuclide) |