5Parent nuclides and progeny nuclides included in secular equilibrium

5 Parent nuclides and progeny nuclides included in secular equilibrium

(1) For the purposes of this instrument, in determining the activity of a parent nuclide mentioned in an item of Part 2 of Schedule 1, include the activity of any progeny nuclide mentioned in that item that is included in secular equilibrium with the parent nuclide.

Note: Parent nuclides are also marked a in Part 1 of Schedule 1.

(2) Except for the purposes of determining under subsection (1) the activity of a parent nuclide mentioned in an item of Part 2 of Schedule 1, the activity of a progeny nuclide mentioned in an item of that Part is taken to be nil when included in secular equilibrium with a parent nuclide mentioned in that item. (3) Subsections (1) and (2) do not apply for the purposes of subsections 65(7) to (9).

Note: Subsections 65(7) to (9) deal with the activity concentration of progeny nuclides in relation to solid clearance material by reference to GSR Part 3.