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The Private Water Supplies Regulations (Northern Ireland) 2017

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Calculation of the ID

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7.  The ID must be calculated from the measured radionuclide concentrations and the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom(1) or more recent information recognised by the Department, on the basis of the annual intake of water (730l for adults).

Where the following formula is satisfied, it can be assumed that the ID is less than the parametric value of 0.1mSv and no further investigation is required.

where

  • Ci(obs) = observed concentration of radionuclide i

  • Ci(der) = derived concentration of radionuclide i (see Table D)

  • n = number of radionuclides detected.

TABLE D
Derived concentrations for radioactivity in water intended for human consumption
OriginRadionuclide(1)Derived concentration (Bq/1)
(1)

This table includes values for the most common natural and artificial radionuclides; these are precise values, calculated for a dose of 0.1mSV, an annual intake of 730 litres and using the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom; derived concentration for other radionuclides can be calculated on the same basis, and values can be updated on the basis of more recent information recognised by the Department.

(2)

This allows only for the radiological properties of uranium, not for its chemical toxicity.

NaturalU-238(2)3.0
U-234(2)2.8
Ra-2260.5
Ra-2280.2
Pb-2100.2
Po-2100.1
ArtificialC-14240
Sr-904.9
Pu-239 / Pu-2400.6
Am-2410.7
Co-6040
Cs-1347.2
Cs-13711
I-1316.2
(1)

O.J. No. L159, 29.6.96, P. 27

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