Schedule 23, Part 6, paragraph 29

In this Section, where any radionuclide carries the suffix “+” or “sec”— that radionuclide represents the parent radionuclide in secular equilibrium with the corresponding daughter radionuclides which are identified in column 2 of Table 8 adjacent to that parent radionuclide, and a concentration or activity value given in respect of such a parent radionuclide is the value for the parent radionuclide alone, but already takes into account the daughter radionuclides in column 2 that are present.

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Source: legislation.gov.uk · retrieved 2026-07-30