TABLE 2. Most important annual flows of activity of radionuclides and of their radiation energy into the global atmosphere.
| SOURCE | ACTIVITY (Bq) |
ENERGY (J) e |
| Natural | 222Rn 3.3 x 1019 | 222Rn 3.0 x 107 |
| Nuclear weapons: explosions & production a | 3 H 7.0 x 1018 |
3 H 2.1 x 104 |
| Chernobyl b | 137 Cs 7.0 x 1016 |
137 Cs 6.1 x 103 |
| Nuclear power c | 3 H 5.6 x 1016 |
222 Rn 1.3 x 104 |
| Natural: Volcanic activity (noneruptive) | 210Po 5.1 x 1015 | 210 Po 4.4 x 103 |
| Coal burning d | 222 Rn 8.5 x 1014 |
222 Rn 7.6 x 102 |
a
Annual average for 1945-1980;