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.
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Or would they just decay in their already known lifetime?
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Alpha particles are stable (assuming no proton decay, but that would have a timescale of >10
30 years).