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 cpm = 16,666,666.667 nGy
1 nGy = 6.0000e-8 cpm
例:
15 毎分カウントをナノグレイに変換します。
15 cpm = 250,000,000 nGy
| 毎分カウント | ナノグレイ |
|---|---|
| 0.01 cpm | 166,666.667 nGy |
| 0.1 cpm | 1,666,666.667 nGy |
| 1 cpm | 16,666,666.667 nGy |
| 2 cpm | 33,333,333.333 nGy |
| 3 cpm | 50,000,000 nGy |
| 5 cpm | 83,333,333.333 nGy |
| 10 cpm | 166,666,666.667 nGy |
| 20 cpm | 333,333,333.333 nGy |
| 30 cpm | 500,000,000 nGy |
| 40 cpm | 666,666,666.667 nGy |
| 50 cpm | 833,333,333.333 nGy |
| 60 cpm | 1,000,000,000 nGy |
| 70 cpm | 1,166,666,666.667 nGy |
| 80 cpm | 1,333,333,333.333 nGy |
| 90 cpm | 1,500,000,000 nGy |
| 100 cpm | 1,666,666,666.667 nGy |
| 250 cpm | 4,166,666,666.667 nGy |
| 500 cpm | 8,333,333,333.333 nGy |
| 750 cpm | 12,500,000,000 nGy |
| 1000 cpm | 16,666,666,666.667 nGy |
| 10000 cpm | 166,666,666,666.667 nGy |
| 100000 cpm | 1,666,666,666,666.667 nGy |
Inayam