放射性是不稳定原子核因辐射失去能量的过程。它以Becquerels(BQ)进行测量。
1 α = 1 β 
1 β = 1 α 
例子: 
将15 α颗粒转换为beta颗粒:
15 α = 15 β 
| α颗粒 | beta颗粒 | 
|---|---|
| 0.01 α | 0.01 β | 
| 0.1 α | 0.1 β | 
| 1 α | 1 β | 
| 2 α | 2 β | 
| 3 α | 3 β | 
| 5 α | 5 β | 
| 10 α | 10 β | 
| 20 α | 20 β | 
| 30 α | 30 β | 
| 40 α | 40 β | 
| 50 α | 50 β | 
| 60 α | 60 β | 
| 70 α | 70 β | 
| 80 α | 80 β | 
| 90 α | 90 β | 
| 100 α | 100 β | 
| 250 α | 250 β | 
| 500 α | 500 β | 
| 750 α | 750 β | 
| 1000 α | 1,000 β | 
| 10000 α | 10,000 β | 
| 100000 α | 100,000 β |