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Promethium igniter.
An example of the element Promethium

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Promethium igniter.
The box for these compact fluorescent bulbs says they contain Pm-147 glow switches, which means a tiny amount of radioactive substance designed to keep the gas inside just ionized enough that the lamp will light when it's turned on.
Source: Unknown
Contributor: Theodore Gray
Acquired: 17 April, 2009
Text Updated: 30 April, 2009
Price: Unknown
Size: 6"
Purity: <0.01%
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