| Subject | English | French |
| radiat. | ionization chamber constant | constante d'une chambrion |
| radiat. | ionization chamber constant | constante d'une chambre d'ionisation |
| nucl.phys., radiat. | ionization constant | coefficient de Townsend |
| radiat. | ionization constant | coefficient d'ionisation (de Townsend) |
| radiat. | ionization constant | constante d'ionisation (of a gas : average energy expended per ion pair formed, divided by electronic charge) |