Sch 3 para 9
In this Schedule “ source term ” means the radioactivity which could give rise to direct external exposures from the premises or which could be released to the environment in a radiation emergency and, for releases, includes— (a) the amount of each radionuclide released; (b) the time distribution of the release; (c) the energy associated with atmospheric release; and (d) the likely chemical and physical form of the radionuclides in the release.