Radiation, what are the real facts?

The nuclear crisis showed that Man is not ready enough for emergencies that deals with nuclear. All these radiations stuff, no one around the world know much about it. All there is are fake sms causing panic. The doctors at the neighborhood clinic are clueless on checking on radiation sickness. People all rushing for salts. Even the informations found on the internet could possible be untrue. So what is it that people really need to know? Will attached this info at least the source is from a news website. Should be reliable enough.