 Complete the following phrase:  The Chernobyl disaster in 1986 was the first major accident at a civilian nuclear power plant. Unparalleled in the world, it resulted in a large number of radioactive isotopes being released into the atmosphere. Radioactive doses have scattered relatively far. 4,000 new cases of thyroid cancer were reported after the incident, but this led to a relatively low number of deaths WHO data, 2005. However, the long-term effects of the accident are unknown. Another major accident is the 