# The Public Water Supplies (Scotland) Regulations 2014, Paragraph 4: Calculation of the indicative dose


(1) The indicative dose must be calculated from—
(a) the measured radionuclide concentrations and the dose coefficients laid down in Table (A) of Annex III to Council Directive 96/29/Euratom laying down basic safety standards for the protection of the health of workers and the general public against the dangers arising from ionizing radiation; or
(b) more recent information recognised by the Scottish Ministers,
on the basis of an annual intake of water of 730 litres for adults.
(2) Where the following formula is satisfied, Scottish Water may assume that the indicative dose is less than 0.1 mSv and that no further investigation is required:—
∑i=lnCi (obs)Ci (der)) ≤1where—
“Ci (obs)” refers to the observed concentration of radionuclide “i”;
“Ci (der)” refers to derived concentration of radionuclide “i”; and
“n” refers to the number of radionuclides detected.

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Source: https://www.legislation.gov.uk/ssi/2014/364/schedule/1A/paragraph/4n3 (the official version)
Page: https://openlegislation.uk/public-water-supplies-scotland-regulations-2014/schedule-1A/paragraph-4n3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.