this post was submitted on 29 Sep 2024
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They did it with uranium too? I knew about radium, but not that.
Uranium wasn't used for watch dials, but Uranium Orange is a colour of cermic glaze. It was pretty popular in America from the 1930's to around 1942, when the government needed all the uranium for some big secret project. After the 60's it was made with depleted uranium, instead of natural ore, until someone realized this still wasn't a great idea.
Fun fact: fiestaware plates (this was the company that made the uraranium glazed ceramics) are commonly used by radiation safety folks as check sources and for teaching how to use survey meters. This is because they usually aren’t considered a radioisotope source, so there’s less paperwork to keep them around.