CANada Deuterium Uranium. CANDU reactors operate with non-enriched natural uranium and pressurised heavy water; this reactor technology was developed by the Atomic Energy of Canada Limited (AECL).

Radiation emitted by certain radioactive nuclei that decay during weak interactions. There are two types of beta decay: beta plus or beta minus. β+ decay occurs when a proton is converted into a neutron, while β- occurs when a neutron is converted into a proton. An electron antineutrino is also emitted. It is not a very penetrating type of radiation as a single sheet of aluminium or several metres of air will stop it.