I remember reading about betavoltaics a coupla years ago. http://www.newscientist.com/blog/invention/2007/07/betavoltiac-batteries.html http://www.newscientist

I remember reading about betavoltaics a coupla years ago. http://www.newscientist.com/blog/invention/2007/07/betavoltiac-batteries.html http://www.newscientist.com/blog/invention/2007/07/betavolti... >>a factor of 50 Yes.