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 Sv = 100 R
1 R = 0.01 Sv
例子:
将15 sievert转换为罗恩根：
15 Sv = 1,500 R
| sievert | 罗恩根 |
|---|---|
| 0.01 Sv | 1 R |
| 0.1 Sv | 10 R |
| 1 Sv | 100 R |
| 2 Sv | 200 R |
| 3 Sv | 300 R |
| 5 Sv | 500 R |
| 10 Sv | 1,000 R |
| 20 Sv | 2,000 R |
| 30 Sv | 3,000 R |
| 40 Sv | 4,000 R |
| 50 Sv | 5,000 R |
| 60 Sv | 6,000 R |
| 70 Sv | 7,000 R |
| 80 Sv | 8,000 R |
| 90 Sv | 9,000 R |
| 100 Sv | 10,000 R |
| 250 Sv | 25,000 R |
| 500 Sv | 50,000 R |
| 750 Sv | 75,000 R |
| 1000 Sv | 100,000 R |
| 10000 Sv | 1,000,000 R |
| 100000 Sv | 10,000,000 R |
规则