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Updated: July 13, 2026
I took a screen made of zincblende, which will phosphoresce when the emanations of radium fall upon it. But the most striking way of showing the emanations is by the little contrivance I call a Spinthariscope. In this a zinc sulphide screen is fitted at the end of a short brass tube, with a speck of radium about a millimeter away from it.
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