放射能は、不安定な原子核が放射によってエネルギーを失うプロセスです。Beckerels（BQ）で測定されます。
1 Gy = 1 n/cm²/s
1 n/cm²/s = 1 Gy
例:
15 グレーを中性子流束に変換します。
15 Gy = 15 n/cm²/s
| グレー | 中性子流束 |
|---|---|
| 0.01 Gy | 0.01 n/cm²/s |
| 0.1 Gy | 0.1 n/cm²/s |
| 1 Gy | 1 n/cm²/s |
| 2 Gy | 2 n/cm²/s |
| 3 Gy | 3 n/cm²/s |
| 5 Gy | 5 n/cm²/s |
| 10 Gy | 10 n/cm²/s |
| 20 Gy | 20 n/cm²/s |
| 30 Gy | 30 n/cm²/s |
| 40 Gy | 40 n/cm²/s |
| 50 Gy | 50 n/cm²/s |
| 60 Gy | 60 n/cm²/s |
| 70 Gy | 70 n/cm²/s |
| 80 Gy | 80 n/cm²/s |
| 90 Gy | 90 n/cm²/s |
| 100 Gy | 100 n/cm²/s |
| 250 Gy | 250 n/cm²/s |
| 500 Gy | 500 n/cm²/s |
| 750 Gy | 750 n/cm²/s |
| 1000 Gy | 1,000 n/cm²/s |
| 10000 Gy | 10,000 n/cm²/s |
| 100000 Gy | 100,000 n/cm²/s |
Inayam