What does Acute radiation syndrome mean?

Acute radiation syndrome meaning in Medical Dictionary

an intense disease brought on by a dose higher than 50 rads of acute radiation to many or all human body in a short time, often a matter of minutes. Examples of persons whom endured severe radiation syndrome (ARS) are the survivors of this Hiroshima and Nagasaki atomic bombs plus the firefighters that first reacted after the Chernobyl Nuclear power-plant occasion in 1986.