What major source produces most beta particles?

The major source producing most beta particles is indeed activated corrosion and fission products. In nuclear reactors and other nuclear processes, fission reactions occur that split heavy atomic nuclei into smaller fragments, resulting in various products, including beta-emitting isotopes.

Activated corrosion products are generated when materials used in reactors interact with neutron radiation. This interaction can lead to the formation of radioactive isotopes, which may emit beta particles as they decay to more stable forms.

Beta particles are high-energy, high-speed electrons or positrons emitted by certain types of radioactive decay, and fission products are one of the primary sources of these emissions in nuclear settings. Therefore, understanding this relationship between nuclear fission, corrosion, and the subsequent production of beta particles is crucial for a comprehensive grasp of radiation sources in nuclear environments.