United States Nuclear Regulatory Commission - Protecting People and the Environment
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Radiation warning symbol

Radiation warning symbol consisting of magenta or black trefoil on a yellow backgroundAn officially prescribed magenta or black trefoil on a yellow background, which must be displayed where certain quantities of radioactive materials are present or where certain doses of radiation could be received. For detail, see the Fact Sheet on the New International Radiation Warning Symbol.

Page Last Reviewed/Updated Wednesday, May 07, 2014