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 n/cm²/s = 60 cpm
1 cpm = 0.017 n/cm²/s
例:
15 中性子流束を毎分カウントに変換します。
15 n/cm²/s = 900 cpm
| 中性子流束 | 毎分カウント |
|---|---|
| 0.01 n/cm²/s | 0.6 cpm |
| 0.1 n/cm²/s | 6 cpm |
| 1 n/cm²/s | 60 cpm |
| 2 n/cm²/s | 120 cpm |
| 3 n/cm²/s | 180 cpm |
| 5 n/cm²/s | 300 cpm |
| 10 n/cm²/s | 600 cpm |
| 20 n/cm²/s | 1,200 cpm |
| 30 n/cm²/s | 1,800 cpm |
| 40 n/cm²/s | 2,400 cpm |
| 50 n/cm²/s | 3,000 cpm |
| 60 n/cm²/s | 3,600 cpm |
| 70 n/cm²/s | 4,200 cpm |
| 80 n/cm²/s | 4,800 cpm |
| 90 n/cm²/s | 5,400 cpm |
| 100 n/cm²/s | 6,000 cpm |
| 250 n/cm²/s | 15,000 cpm |
| 500 n/cm²/s | 30,000 cpm |
| 750 n/cm²/s | 45,000 cpm |
| 1000 n/cm²/s | 60,000 cpm |
| 10000 n/cm²/s | 600,000 cpm |
| 100000 n/cm²/s | 6,000,000 cpm |
Inayam