Regulation 4

Subject to the provisions of paragraphs (2), (3), (4) and (5) of this Regulation, the total activity of any one consignment of nuclear matter containing a single radionuclide or several radionuclides in the same group shall not exceed the limits set out in the Table in Schedule 1 to these Regulations as appropriate to the group to which the radionuclide belongs.

The total activity of any one consignment of radionuclides in the form of special form radioactive material shall not exceed 500 curies.

Where the identity of a radionuclide is not known it shall be deemed to be included in group 1.

Where a consignment of nuclear matter contains any special form radioactive material together with radionuclides not in the form of special form radioactive material, or contains radionuclides not in such form in different groups, the sum of the fractions obtained by dividing the activities of the special form radioactive material and each of the radionuclides not in such form by the relevant limit prescribed in paragraphs (1) or (2) of this Regulation (as the case may be) shall not exceed 1.

For the purposes of the calculation to be made in accordance with paragraph (4) of this Regulation, where the respective activities of any of the radionuclides present are not known, all such radionuclides shall be deemed to belong to the most restrictive group among them.