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 = 0.017 n/cm²/s
1 n/cm²/s = 60 cpm
例子:
将15 每分钟计数转换为中子通量：
15 cpm = 0.25 n/cm²/s
| 每分钟计数 | 中子通量 |
|---|---|
| 0.01 cpm | 0 n/cm²/s |
| 0.1 cpm | 0.002 n/cm²/s |
| 1 cpm | 0.017 n/cm²/s |
| 2 cpm | 0.033 n/cm²/s |
| 3 cpm | 0.05 n/cm²/s |
| 5 cpm | 0.083 n/cm²/s |
| 10 cpm | 0.167 n/cm²/s |
| 20 cpm | 0.333 n/cm²/s |
| 30 cpm | 0.5 n/cm²/s |
| 40 cpm | 0.667 n/cm²/s |
| 50 cpm | 0.833 n/cm²/s |
| 60 cpm | 1 n/cm²/s |
| 70 cpm | 1.167 n/cm²/s |
| 80 cpm | 1.333 n/cm²/s |
| 90 cpm | 1.5 n/cm²/s |
| 100 cpm | 1.667 n/cm²/s |
| 250 cpm | 4.167 n/cm²/s |
| 500 cpm | 8.333 n/cm²/s |
| 750 cpm | 12.5 n/cm²/s |
| 1000 cpm | 16.667 n/cm²/s |
| 10000 cpm | 166.667 n/cm²/s |
| 100000 cpm | 1,666.667 n/cm²/s |
规则