Are you thinking of alpha decay? https://en.wikipedia.org/wiki/Alpha_decay https://en.wikipedia.org/wiki/Alpha_decay I'm not sure there is any conceivable way

Are you thinking of alpha decay? https://en.wikipedia.org/wiki/Alpha_decay https://en.wikipedia.org/wiki/Alpha_decay I'm not sure there is any conceivable way to use that in manufacturing helium gas at an industrial scale.