La radioactivité est le processus par lequel un noyau atomique instable perd de l'énergie par rayonnement.Il est mesuré en Becquerels (BQ).
1 C/kg = 387,600 rad 
1 rad = 2.5800e-6 C/kg 
Exemple: 
Convertir 15 Exposition (c / kg) en Rad:
15 C/kg = 5,814,000 rad 
| Exposition (c / kg) | Rad | 
|---|---|
| 0.01 C/kg | 3,876 rad | 
| 0.1 C/kg | 38,760 rad | 
| 1 C/kg | 387,600 rad | 
| 2 C/kg | 775,200 rad | 
| 3 C/kg | 1,162,800 rad | 
| 5 C/kg | 1,938,000 rad | 
| 10 C/kg | 3,876,000 rad | 
| 20 C/kg | 7,752,000 rad | 
| 30 C/kg | 11,628,000 rad | 
| 40 C/kg | 15,504,000 rad | 
| 50 C/kg | 19,380,000 rad | 
| 60 C/kg | 23,256,000 rad | 
| 70 C/kg | 27,132,000 rad | 
| 80 C/kg | 31,008,000 rad | 
| 90 C/kg | 34,884,000 rad | 
| 100 C/kg | 38,760,000 rad | 
| 250 C/kg | 96,900,000 rad | 
| 500 C/kg | 193,800,000 rad | 
| 750 C/kg | 290,700,000 rad | 
| 1000 C/kg | 387,600,000 rad | 
| 10000 C/kg | 3,876,000,000 rad | 
| 100000 C/kg | 38,760,000,000 rad |