A radioatividade é o processo pelo qual um núcleo atômico instável perde energia por radiação.É medido em Becquerels (BQ).
1 nGy = 2.7027e-20 Ci 
1 Ci = 37,000,000,000,000,000,000 nGy 
Exemplo: 
Converter 15 Nanogray para Curie:
15 nGy = 4.0541e-19 Ci 
| Nanogray | Curie | 
|---|---|
| 0.01 nGy | 2.7027e-22 Ci | 
| 0.1 nGy | 2.7027e-21 Ci | 
| 1 nGy | 2.7027e-20 Ci | 
| 2 nGy | 5.4054e-20 Ci | 
| 3 nGy | 8.1081e-20 Ci | 
| 5 nGy | 1.3514e-19 Ci | 
| 10 nGy | 2.7027e-19 Ci | 
| 20 nGy | 5.4054e-19 Ci | 
| 30 nGy | 8.1081e-19 Ci | 
| 40 nGy | 1.0811e-18 Ci | 
| 50 nGy | 1.3514e-18 Ci | 
| 60 nGy | 1.6216e-18 Ci | 
| 70 nGy | 1.8919e-18 Ci | 
| 80 nGy | 2.1622e-18 Ci | 
| 90 nGy | 2.4324e-18 Ci | 
| 100 nGy | 2.7027e-18 Ci | 
| 250 nGy | 6.7568e-18 Ci | 
| 500 nGy | 1.3514e-17 Ci | 
| 750 nGy | 2.0270e-17 Ci | 
| 1000 nGy | 2.7027e-17 Ci | 
| 10000 nGy | 2.7027e-16 Ci | 
| 100000 nGy | 2.7027e-15 Ci |