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 FP = 100 rem
1 rem = 0.01 FP
例子:
将15 裂变产品转换为REM：
15 FP = 1,500 rem
| 裂变产品 | REM |
|---|---|
| 0.01 FP | 1 rem |
| 0.1 FP | 10 rem |
| 1 FP | 100 rem |
| 2 FP | 200 rem |
| 3 FP | 300 rem |
| 5 FP | 500 rem |
| 10 FP | 1,000 rem |
| 20 FP | 2,000 rem |
| 30 FP | 3,000 rem |
| 40 FP | 4,000 rem |
| 50 FP | 5,000 rem |
| 60 FP | 6,000 rem |
| 70 FP | 7,000 rem |
| 80 FP | 8,000 rem |
| 90 FP | 9,000 rem |
| 100 FP | 10,000 rem |
| 250 FP | 25,000 rem |
| 500 FP | 50,000 rem |
| 750 FP | 75,000 rem |
| 1000 FP | 100,000 rem |
| 10000 FP | 1,000,000 rem |
| 100000 FP | 10,000,000 rem |
规则