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  • 2017-01-09 21:24:08

    Because this vial contains tritium, a radioactive form of hydrogen, it is a very unusual keyring guaranteed to start a conversation. It does indeed glow, not bright as a flashlight but plenty to notice in the dark. I got this as a gift for a friend who teaches earth science, and he likes it a lot. He shows it to his students to indicate how tritium, decaying from its radioactive state and energizing a phosphor, can make a glowing light. Not to worry about it being radioactive -- tritium's energy state

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