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 β = 1 cps
1 cps = 1 β
例子:
将15 beta颗粒转换为每秒计数：
15 β = 15 cps
| beta颗粒 | 每秒计数 |
|---|---|
| 0.01 β | 0.01 cps |
| 0.1 β | 0.1 cps |
| 1 β | 1 cps |
| 2 β | 2 cps |
| 3 β | 3 cps |
| 5 β | 5 cps |
| 10 β | 10 cps |
| 20 β | 20 cps |
| 30 β | 30 cps |
| 40 β | 40 cps |
| 50 β | 50 cps |
| 60 β | 60 cps |
| 70 β | 70 cps |
| 80 β | 80 cps |
| 90 β | 90 cps |
| 100 β | 100 cps |
| 250 β | 250 cps |
| 500 β | 500 cps |
| 750 β | 750 cps |
| 1000 β | 1,000 cps |
| 10000 β | 10,000 cps |
| 100000 β | 100,000 cps |
规则