La radioactivité est le processus par lequel un noyau atomique instable perd de l'énergie par rayonnement.Il est mesuré en Becquerels (BQ).
1 γ = 1,000 mSv 
1 mSv = 0.001 γ 
Exemple: 
Convertir 15 Rayonnement gamma en Millisier:
15 γ = 15,000 mSv 
| Rayonnement gamma | Millisier | 
|---|---|
| 0.01 γ | 10 mSv | 
| 0.1 γ | 100 mSv | 
| 1 γ | 1,000 mSv | 
| 2 γ | 2,000 mSv | 
| 3 γ | 3,000 mSv | 
| 5 γ | 5,000 mSv | 
| 10 γ | 10,000 mSv | 
| 20 γ | 20,000 mSv | 
| 30 γ | 30,000 mSv | 
| 40 γ | 40,000 mSv | 
| 50 γ | 50,000 mSv | 
| 60 γ | 60,000 mSv | 
| 70 γ | 70,000 mSv | 
| 80 γ | 80,000 mSv | 
| 90 γ | 90,000 mSv | 
| 100 γ | 100,000 mSv | 
| 250 γ | 250,000 mSv | 
| 500 γ | 500,000 mSv | 
| 750 γ | 750,000 mSv | 
| 1000 γ | 1,000,000 mSv | 
| 10000 γ | 10,000,000 mSv | 
| 100000 γ | 100,000,000 mSv |