6Parent nuclides and progeny nuclides included in secular equilibrium

6  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 in the table in clause 2 of Schedule 2, 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 the table in clause 1 of Schedule 2.

 (2) Except for the purposes of determining under subsection (1) the activity of a parent nuclide mentioned in an item in the table in clause 2 of Schedule 2, the activity of a progeny nuclide mentioned in an item in that table is taken to be nil when included in secular equilibrium with a parent nuclide mentioned in that item.