10 days of discharge
Radioactive releases during the Chernobyl accident lasted 10 days. Two explosions were responsible for the initial release of radioactive material in a cloud of several kilometers high, then dispersed in the form of plume, a part of which went higher than 1200 m up. The reactor core left bare and the continuing fire the graphite moderator were later at the origin of a continuous release of large quantities of radioactive material into the atmosphere (as gases, aerosols and particulates). The fire in the graphite moderator was stopped after 10 days. (Source: Atlas de Tchernobyl).
IN2P3