| Subject | English | French |
| radiat. | primordial element | élément primitif |
| radiat. | primordial element | élément primordial |
| 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) |