List of alpha emitting materials

The following are among the principal

radioactive Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is consid ...

materials known to emit

alpha particles Alpha particles, also called alpha rays or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus. They are generally produced in the process of alpha decay, but may also be prod ...

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