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 = 100 rem
1 rem = 0.01 n/cm²/s
例子:
将15 中子通量转换为REM：
15 n/cm²/s = 1,500 rem
| 中子通量 | REM |
|---|---|
| 0.01 n/cm²/s | 1 rem |
| 0.1 n/cm²/s | 10 rem |
| 1 n/cm²/s | 100 rem |
| 2 n/cm²/s | 200 rem |
| 3 n/cm²/s | 300 rem |
| 5 n/cm²/s | 500 rem |
| 10 n/cm²/s | 1,000 rem |
| 20 n/cm²/s | 2,000 rem |
| 30 n/cm²/s | 3,000 rem |
| 40 n/cm²/s | 4,000 rem |
| 50 n/cm²/s | 5,000 rem |
| 60 n/cm²/s | 6,000 rem |
| 70 n/cm²/s | 7,000 rem |
| 80 n/cm²/s | 8,000 rem |
| 90 n/cm²/s | 9,000 rem |
| 100 n/cm²/s | 10,000 rem |
| 250 n/cm²/s | 25,000 rem |
| 500 n/cm²/s | 50,000 rem |
| 750 n/cm²/s | 75,000 rem |
| 1000 n/cm²/s | 100,000 rem |
| 10000 n/cm²/s | 1,000,000 rem |
| 100000 n/cm²/s | 10,000,000 rem |
规则