2. Calculation of the ID
The ID shall be calculated from the measured radionuclide concentrations and the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom or more recent information recognised by the competent authorities in the Member State, on the basis of the annual intake of water (730 l for adults). Where the following formula is satisfied, Member States may assume that the ID is less than the parametric value of 0,1 mSv and no further investigation shall be required:
where
=
observed concentration of radionuclide i
=
derived concentration of radionuclide i
=
number of radionuclides detected.
Derived concentrations for radioactivity in water intended for human consumption a
| a This table includes values for the most common natural and artificial radionuclides; these are precise values, calculated for a dose of 0,1 mSv, an annual intake of 730 litre and using the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom; derived concentrations 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 competent authorities in the Member State. | ||
| b This table allows only for the radiological properties of uranium, not for its chemical toxicity. | ||
| Origin | Nuclide | Derived concentration |
|---|---|---|
| Natural | U-238b | 3,0 Bq/l |
| U-234b | 2,8 Bq/l | |
| Ra-226 | 0,5 Bq/l | |
| Ra-228 | 0,2 Bq/l | |
| Pb-210 | 0,2 Bq/l | |
| Po-210 | 0,1 Bq/l | |
| Artificial | C-14 | 240 Bq/l |
| Sr-90 | 4,9 Bq/l | |
| Pu-239/Pu-240 | 0,6 Bq/l | |
| Am-241 | 0,7 Bq/l | |
| Co-60 | 40 Bq/l | |
| Cs-134 | 7,2 Bq/l | |
| Cs-137 | 11 Bq/l | |
| I-131 | 6,2 Bq/l | |