Leonid Telyatnikov

Leonid Petrovich Telyatnikov was the head of the fire department at the Chernobyl Nuclear Power Plant and led the team of firefighters to the fire at reactor numberwhich became the Chernobyl disaster. Despite the radiological dangers, they had no radiation suits, no respirators, and no working dosimeters. From results of a blood test it was estimated he receivedgrays of radiation.

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Source: Wikipedia