# The Radioactive Substances (Uranium and Thorium) Exemption Order 1962, Article 2: Interpretation


(1) In this order—
“the Act” means the Radioactive Substances Act 1960;
“decay products” means, in relation to any radionuclide, the radionuclides succeeding it in the radioactive series in which it and they occur;
“hardener alloy” means an alloy of magnesium falling within Article 4 (a) (ii) of this order and containing by weight more than four per cent. of natural thorium;
“magnesium alloy” means an alloy of magnesium falling within the said Article 4 (a) (ii) and containing by weight four per cent. or less of natural thorium;
“month” means any period of four consecutive weeks;
“natural thorium” means a mixture of thorium extracted by a chemical process or processes the purpose or one of the purposes of which was the production of thorium, and decay products of thorium, being a mixture in which—
(a) the number of microcuries of thorium giving rise to the emission of alpha particles does not exceed 1·7 per gramme of thorium; and
(b) the number of microcuries of any of the decay products of thorium 232 does not exceed the number of microcuries of thorium 232 and the number of microcuries of any of the decay products of thorium 230 does not exceed the number of microcuries of thorium 230; and
(c) the decay products of isotopes of thorium consist of the remainder (if any) of the decay products present with those isotopes at the time the thorium was extracted and the decay products formed since that time through radioactive decay occurring in the mixture;
“natural uranium” means a mixture of uranium extracted by a chemical process or processes the purpose or one of the purposes of which was the production of uranium, and decay products of uranium, being a mixture in which—
(a) the uranium comprises the isotopes 238, 235 and 234 and contains by weight not more than 0·72 per cent. of the isotope 235: and
(b) the number of microcuries of any of the decay products of uranium 238 does not exceed the number of microcuries of uranium 238, and the number of microcuries of any of the decay products of uranium 235 does not exceed the number of microcuries of uranium 235; and
(c) the decay products (other than uranium 234) of isotopes of uranium consist of the remainder (if any) of the decay products present with those isotopes at the time the uranium was extracted and the decay products formed since that time through radioactive decay occurring in the mixture;
“refuse disposal authority” means a local authority within the meaning of the Public Health Act 1936 or a sanitary authority within the meaning of the Public Health (London) Act 1936 acting in pursuance of statutory powers or duties relating to the removal and disposal of refuse;
“the Schedule 3 elements” means the elements specified in column 1 of Schedule 3 to the Act;
“thoria ware” means fired ceramic and refractory articles made wholly or substantially of thorium dioxide;
“thoriated tungsten” means thoriated tungsten falling within Article 4 (a) (ii) of this order and containing by weight four per cent. or less of natural thorium;
“weight” means weight ascertained by weighing or, where it is not reasonably practicable to ascertain weight by weighing, weight as calculated by any generally accepted method;
and any reference to an exempted substance or article is a reference to a substance or article falling within Article 4 of this order.
(2) For the purposes of paragraphs (a) and (b) of Article 6 of this order and paragraphs (2) and (3) of Article 7, all premises in the same occupation and lying within the same curtilage shall together be treated as the premises in respect of which the conditions in those paragraphs apply.
(3) The Interpretation Act 1889 applies to the interpretation of this order as it applies to the interpretation of an Act of Parliament.

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Source: https://www.legislation.gov.uk/uksi/1962/2710/article/2 (the official version)
Page: https://openlegislation.uk/radioactive-substances-uranium-and-thorium-exemption-order-1962/article-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.