# The Environmental Permitting (England and Wales) Regulations 2016, Paragraph 3: References in Table 1 and Table 2 to + and sec


Where any radionuclide carries the suffix “+” or “sec” in Table 1 or Table 2—
(a) 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
(b) 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: https://www.legislation.gov.uk/ukdsi/2016/9780111150184/schedule/23/part/3/paragraph/3 (the official version)
Page: https://openlegislation.uk/draft-environmental-permitting-england-and-wales-regulations-2016/schedule-23/part-3/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.