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Nov16-12, 08:18 AM
P: 11,840
Alpha particles at which energy? They usually come from nuclear reactions and have an energy of ~MeV. They are way quicker than your gas and won't be influenced by its temperature (~40 meV). Before they reach thermal energy, they capture electrons and stop being charged.

Or would they just decay in their already known lifetime?
Alpha particles are stable (assuming no proton decay, but that would have a timescale of >1030 years).