This 1930’s watch face had radium painted numerals to permanently glow in the dark. It has long stopped being visible as the phosphor degenerated. Strong UV light can still light it up but not as much as a bag of similar phosphor (activated zinc sulphide) shown here.
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Uranium ore (Yellowcake) emits gamma radiation. The Geiger counter reads 108,000 CPM through the plastic of the container.
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Tritium tubes have radioactive tritium gas and a phosphor which glows constantly. Tritium is hydrogen with two neutrons. It is radioactive with a half life of 12.3 years.
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A Geiger counter measures various types of ionising radiation such as Gamma rays. Shown here with antique Uranium marbles that were bright due to some fluorescence.
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A sampler of mildly radioactive mineral sands mined locally.
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