Sleeping next to someone (0.05 µSv)

          This radiation dose chart (created by Randall Monroe of xkcd) explains in layman's terms some of the various sources of radiation and their relative dangers.

           My favorite notes:

          Eating one banana (0.1 µSv).

          A cell-phone's transmitter does not produce ionizing radiation and does not cause cancer (unless it's a bananaphone).  

          If you are basing radiation safety procedures on an internet PNG image and things go wrong, you have no one to blame but yourself.