First 24 hours: Rinse off in the shower and stay inside until further notice

The hours after a blast are critical for reducing radiation exposure.

• People who were outside during an explosion should shower as soon as possible, making sure the water is warm and soap is applied gently. Scrubbing too hard could break your skin, which acts as a natural protective barrier. You should also cover any cuts or abrasions while rinsing off. 
• Don't use conditioner, body lotion, or face cream after exposure to a nuclear blast, since these products can bind to radioactive particles and trap them in your skin and hair.
• Blow your nose and wipe your ears and eyelids, since debris could get stuck in these places.