alpha decay

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Related to Alpha emission: gamma emission, Beta emission

alpha decay

High-energy (i.e., in the million-electron-volt range) radioactive decay products caused by the emission of alpha particles, which themselves are products of a disintegrating nucleus.
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As the two Voyager probes moved farther and farther from the Sun-from 1993 to 2003, they travelled between six and 13 billion kilometers (40 to 90 Astronomical Units) from the Sun-the glow of local Lyman alpha emissions in the vicinity of the probes has become easier to detect, growing 20 times more intense than if observed from Earth orbit.
The new K&S alloy, LF-2, demonstrated alpha emissions well below the detection limits of existing measuring equipment and also exhibited higher reliability and a significant improvement in electromigration.
The measurements are from Voyager's ultraviolet spectrometer, or UVS, and include readings of what are called Lyman alpha emissions, given off by hydrogen atoms such as those released from water.