Beta decay meaning

beta decay describes, in radiation and nuclear law practice, a form of radioactive decay in which an unstable atom emits a beta particle, relevant to assessing and controlling ionising radiation in workplaces, healthcare, the environment and the transport of radioactive material. It occurs in two forms: beta minus (β−), where a neutron becomes a proton and an electron is emitted; and beta plus (β+ or positron emission), where a proton becomes a neutron and a positron is emitted, often followed by annihilation photons. The distinction is material for dose assessment, shielding, monitoring, waste classification, transport labelling and environmental permitting. The term is scientific rather than a defined legal term, but it is used descriptively across legislation and guidance that regulate ionising radiation and radioactive substances. In the UK, this includes the Ionising Radiations Regulations 2017 and radioactive substances controls (for example, Environmental Permitting in England and Wales, Environmental Authorisations in Scotland and the Radioactive Substances Act regime in Northern Ireland). In Ireland, the EU Basic Safety Standards are implemented in national law and treat beta emissions as ionising radiation. Usage and meaning are consistent across England & Wales, Scotland, Northern Ireland and Ireland; any differences lie in the regulatory frameworks, not the...