Deaths due to the Chernobyl disaster 800 roentgens, twice the normal 50% probability of death dose. The following list is of those directly killed by the explosion and initial radioactivity release, or in the support efforts that followed. Deaths due to the Chernobyl disaster The Chernobyl disaster (, "Chornobylʹsʹka katastrofa", "Chernobyl accident") was considered as one of the worst nuclear disasters in history. It occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the Ukrainian Soviet Socialist Republic, then part of the Soviet Union, now in Ukraine. The scientific consensus on the effects of the disaster has been developed by the United Nations
Effects of the Chernobyl disaster were involved in the cleanup of the 30 km evacuation zone around the reactor, but many of them entered the zone two years after the disaster. Estimates of the number of "liquidators" vary; the World Health Organization, for example, puts the figure at about 600,000; Russia lists as liquidators some people who did not work in contaminated areas. In the first year after the disaster, the number of cleanup workers in the zone was estimated to be 2,000. These workers received an estimated average dose of 165 millisieverts (16.5 REM). A sevenfold increase in DNA mutations has been identified in