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 cpm = 1.667 rad
1 rad = 0.6 cpm
例子:
将15 每分钟计数转换为rad：
15 cpm = 25 rad
| 每分钟计数 | rad |
|---|---|
| 0.01 cpm | 0.017 rad |
| 0.1 cpm | 0.167 rad |
| 1 cpm | 1.667 rad |
| 2 cpm | 3.333 rad |
| 3 cpm | 5 rad |
| 5 cpm | 8.333 rad |
| 10 cpm | 16.667 rad |
| 20 cpm | 33.333 rad |
| 30 cpm | 50 rad |
| 40 cpm | 66.667 rad |
| 50 cpm | 83.333 rad |
| 60 cpm | 100 rad |
| 70 cpm | 116.667 rad |
| 80 cpm | 133.333 rad |
| 90 cpm | 150 rad |
| 100 cpm | 166.667 rad |
| 250 cpm | 416.667 rad |
| 500 cpm | 833.333 rad |
| 750 cpm | 1,250 rad |
| 1000 cpm | 1,666.667 rad |
| 10000 cpm | 16,666.667 rad |
| 100000 cpm | 166,666.667 rad |
规则