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 RD = 1,000,000,000 nGy
1 nGy = 1.0000e-9 RD
例子:
将15 辐射衰减转换为纳米：
15 RD = 15,000,000,000 nGy
| 辐射衰减 | 纳米 |
|---|---|
| 0.01 RD | 10,000,000 nGy |
| 0.1 RD | 100,000,000 nGy |
| 1 RD | 1,000,000,000 nGy |
| 2 RD | 2,000,000,000 nGy |
| 3 RD | 3,000,000,000 nGy |
| 5 RD | 5,000,000,000 nGy |
| 10 RD | 10,000,000,000 nGy |
| 20 RD | 20,000,000,000 nGy |
| 30 RD | 30,000,000,000 nGy |
| 40 RD | 40,000,000,000 nGy |
| 50 RD | 50,000,000,000 nGy |
| 60 RD | 60,000,000,000 nGy |
| 70 RD | 70,000,000,000 nGy |
| 80 RD | 80,000,000,000 nGy |
| 90 RD | 90,000,000,000 nGy |
| 100 RD | 100,000,000,000 nGy |
| 250 RD | 250,000,000,000 nGy |
| 500 RD | 500,000,000,000 nGy |
| 750 RD | 750,000,000,000 nGy |
| 1000 RD | 1,000,000,000,000 nGy |
| 10000 RD | 9,999,999,999,999.998 nGy |
| 100000 RD | 99,999,999,999,999.98 nGy |
规则