beta (beta) particle

be·ta (β) par·ti·cle

(bā'tă-pahr'ti-kĕl)
An electron, either positively (positron, β+) or negatively (negatron, β-) charged, emitted during beta decay of a radionuclide.
Synonym(s): beta ray.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

be·ta (β) par·ti·cle

(bā'tă-pahr'ti-kĕl)
An electron, either positively (positron, β+) or negatively (negatron, β-) charged, emitted during beta decay of a radionuclide.
Synonym(s): beta ray.
Medical Dictionary for the Dental Professions © Farlex 2012