The upper iimage is the symbol for the U.S. Environmental Protection Agency.

The lower image is the international symbol for irradiated food, the "radura."

They look very similar, don't they?

People have a good feeling about the EPA, because it is supposed to be a watchdog for the people.

People don't have a good feeling about irradiation, because it often uses radioactive materials, and it benefits meat and poultry packers and producers, not the consumer.

The EPA symbol appropriately shows water, the sun and a flower.

The radura shows a flower in a broken circle, symbolizing the radiation.

The radura distracts your attention from the fact that irradiation is mostly about 'sterilizing' feces-contaminated food, not about preserving flowers.