The following are among the principal radionuclides known to undergo alpha decay, emitting alpha particles.

• ²⁰⁹
  Bi , ²¹¹
  Bi , ²¹²
  Bi , ²¹³
  Bi
• ²¹⁰
  Po , ²¹¹
  Po , ²¹²
  Po , ²¹⁴
  Po , ²¹⁵
  Po , ²¹⁶
  Po , ²¹⁸
  Po
• ²¹⁵
  At , ²¹⁷
  At , ²¹⁸
  At
• ²¹⁸
  Rn , ²¹⁹
  Rn , ²²⁰
  Rn , ²²²
  Rn , ²²⁶
  Rn
• ²²¹
  Fr
• ²²³
  Ra , ²²⁴
  Ra , ²²⁶
  Ra
• ²²⁵
  Ac , ²²⁷
  Ac
• ²²⁷
  Th , ²²⁸
  Th , ²²⁹
  Th , ²³⁰
  Th , ²³²
  Th
• ²³¹
  Pa
• ²³³
  U , ²³⁴
  U , ²³⁵
  U , ²³⁶
  U , ²³⁸
  U
• ²³⁷
  Np
• ²³⁸
  Pu , ²³⁹
  Pu , ²⁴⁰
  Pu , ²⁴⁴
  Pu
• ²⁴¹
  Am
• ²⁴⁴
  Cm , ²⁴⁵
  Cm , ²⁴⁸
  Cm
• ²⁴⁹
  Cf , ²⁵²
  Cf

See also

• Common beta emitters
• Commonly used gamma-emitting isotopes