Residual radioactive material in the global environment as a result of the Chernobyl accident in April 1986
| Significant radionuclide | Released in 1986 (PBq*) | Remaining in 1996 (PBq) | Remaining in 2056 (PBq) |
| I-131 | 1200 - 1700 | 0 | 0 |
| Sr-90 | 8 | 6 | 1.5 |
| Cs-134 | 44 48 | 1.6 | 0 |
| Cs-137 | 74 85 | 68 | 17 |
| Pu-238 | 0.03 | 0.03 | 0.02 |
| Pu-239 | 0.03 | 0.03 | 0.03 |
| Pu-240 | 0.044 | 0.044 | 0.03 |
| Pu-241 | 5.9 | 3.6 | 0.2 |
| Am-241** | 0.005 | 0.08 | 0.2 |
*1PBq = 1015 Bq. Estimate of release decay corrected to 26 April 1986, the day of the accident. **The activity of americium-241 in 1996 has increased since 1986 as it is a daughter product of plutonium-241 (half-life 14 years). This increase has to be considered in any radiological prognosis; however, the doses from americium-241 will not exceed the presentdoses from other radionuclides.