Commonwealth Consolidated Regulations Commonwealth Consolidated Regulations(1) For paragraphs (c) and (d) of the definition of nuclear installation in subsection 22 (1) of the Act, the activity level is:
(a) if the installation contains only 1 type of nuclide and all sources of that nuclide are sealed sources -- 10 9 times the activity mentioned for the nuclide in column 4 of Part 2 of Schedule 2 to the ARPNS Regulations; or
(b) if the installation contains only 1 type of nuclide and all sources of that nuclide are unsealed sources -- 10 6 times the activity mentioned in column 4 of Part 2 of Schedule 2 to the ARPNS Regulations for the nuclide at or above the activity concentration mentioned in column 3 of Part 2 of that Schedule for the nuclide; or
(c) in any other case -- a level for which a mixture of sealed and unsealed sources of nuclides is excessive.
(2) A mixture is excessive if:
(a) the sealed source activity value is greater than 10 9 ; or
(b) the unsealed source activity value is greater than 10 6 and the unsealed source activity concentration value is greater than 1; or
(c) both:
(i) the sum of the sealed source activity value divided by 10 9 and the unsealed source activity value divided by 10 6 is greater than 1; and
(ii) the unsealed source activity concentration value is greater than 1.
(3) In this regulation:
"sealed source activity value" means the sum of the fractions calculated for each nuclide by dividing the activity of the nuclide in the mixture in sealed sources by the activity mentioned in column 4 of Part 2 of Schedule 2 to the ARPNS Regulations for the nuclide.
"unsealed source activity concentration value" means the sum of the fractions calculated for each nuclide by dividing the activity concentration for each nuclide in the mixture by the activity concentration mentioned in column 3 of Part 2 of Schedule 2 to the ARPNS Regulations for the nuclide.
"unsealed source activity value" means the sum of the fractions calculated for each nuclide by dividing the activity of each nuclide in the mixture in unsealed sources by the activity mentioned in column 4 of Part 2 of Schedule 2 to the ARPNS Regulations for the nuclide.