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The radura is the official international symbol for irradiated foods as mandated by the FDA in 1986. There was a discussion in 1999 to cancel its use (due to a loophole in the FDA Modernization Act of 1997) but it is still in use today, and can be found, accompanied with a statement about being irradiated, on products that have been treated with radiation.
Some places you can find the radura include fresh produce and meat in your local grocery store. Restaurants using irradiated ingredients are not required to display a radura.
Critics of the radura argue that it resembles "greener" logos such as those for Earth Day and recycling, or even the EPA itself.
The word was created from two Latin words: the verb radio, radiare meaning to gleam, emit rays, or radiate; and the noun radius meaning a staff, rod, stake, or spoke of a wheel.
http://www.extension.iastate.edu/foodsafety/rad/radura.html for information
http://www.purefood.org/Irrad/EPA-radura.cfm for the EPA logo
http://www.degraeve.com/gif2txt.shtml for image conversion