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 cps = 60 cpm 
1 cpm = 0.017 cps 
例子: 
将15 每秒计数转换为每分钟计数:
15 cps = 900 cpm 
| 每秒计数 | 每分钟计数 | 
|---|---|
| 0.01 cps | 0.6 cpm | 
| 0.1 cps | 6 cpm | 
| 1 cps | 60 cpm | 
| 2 cps | 120 cpm | 
| 3 cps | 180 cpm | 
| 5 cps | 300 cpm | 
| 10 cps | 600 cpm | 
| 20 cps | 1,200 cpm | 
| 30 cps | 1,800 cpm | 
| 40 cps | 2,400 cpm | 
| 50 cps | 3,000 cpm | 
| 60 cps | 3,600 cpm | 
| 70 cps | 4,200 cpm | 
| 80 cps | 4,800 cpm | 
| 90 cps | 5,400 cpm | 
| 100 cps | 6,000 cpm | 
| 250 cps | 15,000 cpm | 
| 500 cps | 30,000 cpm | 
| 750 cps | 45,000 cpm | 
| 1000 cps | 60,000 cpm | 
| 10000 cps | 600,000 cpm | 
| 100000 cps | 6,000,000 cpm |