Potassium has some natural beta radiation (high speed electrons or positrons) and can penetrate paper but not a few mm of aluminium.
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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.
“Continue reading” for a hotter Uranium sample, specifications and links…
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