Obtain public emergency information materials from the power company that operates your local nuclear power plant or your local emergency services office. If you live within 10 miles of the power plant, you should receive these materials yearly from the power company or your state or local government.
Minimizing Exposure to Radiation
Distance – The more distance between you and the source of the radiation, the better. This could be evacuation or remaining indoors to minimize exposure.
Shielding – The more heavy, dense material between you and the source of the radiation, the better
Time – Most radioactivity loses its strength fairly quickly.
All information above is from the FEMA website.