The first thing....

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GamerwithnoGame

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Jan 29, 2015
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Units.

It’s related to a derived unit of ionising radiation dose (the Sievert); it’s not restricted to alpha. It’s often used when measuring radioactivity in terms of potential low level hazard to the human body - many dose meters measure emitted radiation thusly (in μSv/h)
 

GamerwithnoGame

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Jan 29, 2015
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MacGuffin (because I’m sure quantum strings, filaments and singularities came up on multiple occasions as plot devices in Star Trek)