SCHEDULE 23Radioactive substances activities

PART 3Tables of radionuclides and summation rules

References in Table 1 and Table 2 to + and sec3

Where any radionuclide carries the suffix “+” or “sec” in Table 1 or Table 2—

a

that radionuclide represents the parent radionuclide in secular equilibrium with the corresponding daughter radionuclides which are identified in column 2 of Table 3 in respect of that parent radionuclide, and

b

a concentration value given in a table in this Part in respect of such a parent radionuclide is the value for the parent radionuclide alone, but already takes into account the daughter radionuclides present.