the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.

2 protons and 2 neutrons emitted from a nucleus.

\the process or result of joining two or more things together to form a single entity

the process or result of joining two or more things together to form a single entity

A fast-moving electron emitted by radioactive decay of substances.

relating to gamma rays

the time taken for the radioactivity of a specified isotope to fall to half its original value.

a subatomic particle with the same mass as an electron and a numerically equal but positive charge.