They can't maintain high speed for long. "The charge of the beta particle will continuously cause ionization along the path that it is traveling. Because of thi

They can't maintain high speed for long. "The charge of the beta particle will continuously cause ionization along the path that it is traveling. Because of this, when a beta particle enters some material, it begins slowing down, and slows down continuously." Same link as above: http://www.alpharubicon.com/basicnbc/RadiationPenetration.htm http://www.alpharubicon.com/basicnbc/RadiationPenetration.ht...