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