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 t½ = 1,000,000 μSv
1 μSv = 1.0000e-6 t½
例子:
将15 半衰期转换为Microsievert：
15 t½ = 15,000,000 μSv
| 半衰期 | Microsievert |
|---|---|
| 0.01 t½ | 10,000 μSv |
| 0.1 t½ | 100,000 μSv |
| 1 t½ | 1,000,000 μSv |
| 2 t½ | 2,000,000 μSv |
| 3 t½ | 3,000,000 μSv |
| 5 t½ | 5,000,000 μSv |
| 10 t½ | 10,000,000 μSv |
| 20 t½ | 20,000,000 μSv |
| 30 t½ | 30,000,000 μSv |
| 40 t½ | 40,000,000 μSv |
| 50 t½ | 50,000,000 μSv |
| 60 t½ | 60,000,000 μSv |
| 70 t½ | 70,000,000 μSv |
| 80 t½ | 80,000,000 μSv |
| 90 t½ | 90,000,000 μSv |
| 100 t½ | 100,000,000 μSv |
| 250 t½ | 250,000,000 μSv |
| 500 t½ | 500,000,000 μSv |
| 750 t½ | 750,000,000 μSv |
| 1000 t½ | 1,000,000,000 μSv |
| 10000 t½ | 10,000,000,000 μSv |
| 100000 t½ | 100,000,000,000 μSv |
规则