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