Conference marks 20th anniversary of Chernobyl disaster

Ukraine today opened a week of commemorations 20 years after the world’s worst nuclear disaster, as international radiation and health experts gathered for a three-day conference to discuss the lessons of the Chernobyl accident.

The April 26, 1986, explosion at Chernobyl’s reactor No.4 spewed radiation across much of northern Europe over a 10-day period.