Alpha Ray 2 : Nuclear Energy and Nuclear Disasters. Streams of alpha particles, they have a range of 2 to 3 in. through air and can be stopped by a sheet of paper or the external layer of skin. See: Alpha Radiation
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}