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