SCHEDULE 23Radioactive substances activities

PART 6Radioactive substances activity exemptions

SECTION 9Tables and summation rules in this Part

Interpretation of this Section29

In this Section, where any radionuclide carries the suffix “+” or “sec”—

a

that radionuclide represents the parent radionuclide in secular equilibrium with the corresponding daughter radionuclides which are identified in column 2 of Table 8 adjacent to that parent radionuclide, and

b

a concentration or activity value given in respect of such a parent radionuclide is the value for the parent radionuclide alone, but already takes into account the daughter radionuclides in column 2 that are present.