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An '''beta minus particle''' ('''β-particle''') is a type of [[Ionising Radiation|ionising radiation]] made of an [[electron]] [[emit]]ted from the [[Atomic Nucleus|nucleus]] of an [[Unstable Isotope|unstable isotope]] when a [[Down-quark]] turns into a [[Up-quark]].

: '''Beta particles''' may also be referred to as '''beta radiation''' and is written with the symbol '''<math>β^-</math>'''.

: '''Beta particles''' are a fast moving [[electron]] [[emit]]ted from the [[Atomic Nucleus|nucleus]] of an [[Unstable Isotope|unstable isotope]].