# The Ionising Radiations Regulations (Northern Ireland) 2017, Paragraph 1


For the purpose of Regulation 2(4)—
(a) the quantity ratio for more than one radionuclide is the sum of the quotients of the quantity of a radionuclide present Qp divided by the quantity of that radionuclide specified in the appropriate entry in Parts 1,2 or 4 of this Schedule Qlim, namely—
∑ Q p Q lim
(b) the concentration ratio for more than one radionuclide is the sum of the quotients of the concentration of a radionuclide present Cp divided by the concentration of that radionuclide specified in the appropriate entry in Parts 1 or 2 of this Schedule Clim, namely—
∑ C p C lim

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Source: https://www.legislation.gov.uk/nisr/2017/229/schedule/7/paragraph/1 (the official version)
Page: https://openlegislation.uk/ionising-radiations-regulations-northern-ireland-2017/schedule-7/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.