This includes x-ray apparatus, radiotherapy linear accelerators, and particle accelerators. Ionizing radiation is a much broader category than radioactivity alone, as many non-radioactive sources also emit potentially dangerous levels of ionizing radiation. The sign is commonly referred to as a radioactivity warning sign, but it is actually a warning sign of ionizing radiation. The trefoil is black in the international version, which is also used in the United States. The original version used in the United States is magenta against a yellow background, and it is drawn with a central circle of radius R, an internal radius of 1.5 R and an external radius of 5 R for the blades, which are separated from each other by 60°.
At the time, it was rendered as magenta, and was set on a blue background. The international radiation symbol (also known as the trefoil) first appeared in 1946, at the University of California, Berkeley Radiation Laboratory.
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