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An '''alpha particle''' is a positively charged [[particle]] (a [[Helium-4]] [[nucleus]]) made up of two [[neutron]]s and two [[proton]]s. It is the least penetrating of the three common forms of [[radiation]], being stopped by a sheet of paper. It is not dangerous to living things unless the alpha-emitting substance is inhaled or ingested or comes into contact with the [[lens]] of the [[eye]].<ref>''Glencoe Physics, Principles and Problems, Teacher Edition''.</ref>
An '''alpha particle''' is a positively charged [[particle]] (a [[Helium-4]] [[nucleus]]) made up of two [[neutron]]s and two [[proton]]s. It is the least penetrating of the three common forms of [[radiation]], being stopped by a sheet of paper. It is not dangerous to living things unless the alpha-emitting substance is inhaled or ingested or comes into contact with the [[lens]] of the [[eye]].<ref>''Glencoe Physics, Principles and Problems, Teacher Edition''.</ref>
==References==
{{Reflist}}
[[Category:Subatomic Particles]][[Category:Radioactivity]][[Category:Physics]]
[[Category:Subatomic Particles]][[Category:Radioactivity]][[Category:Physics]]