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 n/cm²/s = 1 FP
1 FP = 1 n/cm²/s
例子:
将15 中子通量转换为裂变产品：
15 n/cm²/s = 15 FP
| 中子通量 | 裂变产品 |
|---|---|
| 0.01 n/cm²/s | 0.01 FP |
| 0.1 n/cm²/s | 0.1 FP |
| 1 n/cm²/s | 1 FP |
| 2 n/cm²/s | 2 FP |
| 3 n/cm²/s | 3 FP |
| 5 n/cm²/s | 5 FP |
| 10 n/cm²/s | 10 FP |
| 20 n/cm²/s | 20 FP |
| 30 n/cm²/s | 30 FP |
| 40 n/cm²/s | 40 FP |
| 50 n/cm²/s | 50 FP |
| 60 n/cm²/s | 60 FP |
| 70 n/cm²/s | 70 FP |
| 80 n/cm²/s | 80 FP |
| 90 n/cm²/s | 90 FP |
| 100 n/cm²/s | 100 FP |
| 250 n/cm²/s | 250 FP |
| 500 n/cm²/s | 500 FP |
| 750 n/cm²/s | 750 FP |
| 1000 n/cm²/s | 1,000 FP |
| 10000 n/cm²/s | 10,000 FP |
| 100000 n/cm²/s | 100,000 FP |
规则