Category talk:Ionizing radiation warning signs
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Motivation[edit]
The usual well-known yellow warning sign is actually NOT a radioactivity symbol. It is a warning sign of dangerous Ionizing Radiation.
Ionizing radiation is a much broader category than just radioactivity. It is also caused by particle accelerators and medical equipment such as x-ray scanners or beam-cannons for example. It is true that radioactive radiation is (usually) also ionizing, but it is just a sub-group.
One easy source here: [1]