Schedule 23, Part 3, paragraph 3

Where any radionuclide carries the suffix “+” or “sec” in Table 1 or Table 2— that radionuclide represents the parent radionuclide in secular equilibrium with the corresponding daughter radionuclides which are identified in column 2 of Table 3 in respect of that parent radionuclide, and a concentration value given in a table in this Part in respect of such a parent radionuclide is the value for the parent radionuclide alone, but already takes into account the daughter radionuclides present.

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