Skip to Content
Medical Term:

alpha particle


Definition: a particle consisting of two neutrons and two protons, with a positive charge (2e+); emitted energetically from the nuclei of unstable isotopes of high atomic number (elements of mass number from 82 up); identical to the helium nucleus.

Synonym(s): alpha ray

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.