Nuclear Substances and Radiation Devices Regulations — 1
ed source assembly, a drive mechanism, a sealed source assembly guide tube and an exposure head. ( appareil d’exposition ) IAEA Safety Standard RS-G-1.7 means the IAEA Safety Standards, Safety Guide No. RS-G-1.7 — Application of the Concepts of Exclusion, Exemption and Clearance , 2004 Edition published by the International Atomic Energy Agency. ( Norme de sûreté RS-G-1.7 de l’AIEA ) licensed activity means an activity described in any of paragraphs 26(a) to (c) of the Act that a licence authorizes the licensee to carry on in relation to a nuclear substance or a radiation device. ( activité autorisée ) licensee means a person who is licensed to carry on an activity described in any of paragraphs 26(a) to (c) of the Act in relation to a nuclear substance or a radiation device. ( titulaire de permis ) natural uranium means uranium that contains uranium 235 in a concentration that is normally found in nature. ( uranium naturel ) nuclear criticality means a self-sustaining chain reaction of nuclear fission. ( criticité nucléaire ) operate includes, in respect of an exposure device, coupling the drive mechanism to the exposure device, uncoupling the drive mechanism from the exposure device, locking or unlocking the exposure device, and all activities involving the device that take place while the sealed source assembly is not locked inside the device in the fully shielded position. ( faire fonctionner ) prescribed equipment means the equipment prescribed by section 20 of the General Nuclear Safety and Control Regulations . ( équipement réglementé ) radiation device means (a) a device that contains more than the exemption quantity of a nuclear substance and that enables the nuclear substance to be used for its radiation properties; and (b) a device that contains a radium luminous compound. ( appareil à rayonnement ) radiation survey meter means an instrument that is capable of measuring radiation dose rates. ( radiamètre ) sealed source means a radioactive nuclear substance in a sealed capsule or in a cover to which the substance is bonded, where the capsule or cover is strong enough to prevent contact with or the dispersion of the substance under the conditions for which the capsule or cover is designed. ( source scellée ) sealed source assembly means a sealed source that is designed to be used in an exposure device, and includes the components that are permanently attached to the sealed source. ( assemblage de source scellée ) servicing in respect of radiation devices, means any maintenance of a device, including installation, repair, or dismantling, other than maintenance that (a) constitutes routine operating procedures as indicated in the manufacturer’s operating manual for the device; or (b) is authorized in the licence issued in respect of the possession or use of the device. ( entretien ) specific activity means the activity per unit mass. ( activité spécifique ) unconditional clearance level , in respect of a bulk quantity of material, except for surface contaminated material, in which the radioactive nuclear substance is uniformly distributed, means an activity concentration that (a) in respect of a radioactive nuclear substance set out in column 1 of Schedule 2, is the corresponding activity concentration set out in column 2; (b) in respect of a radioactive nuclear substance that is not set out in column 1, (i) is 1 Bq/g, if the atomic number of the substance is equal to or less than 81, (ii) is 1 Bq/g, if the atomic number of the substance is greater than 81 and the substance, or its short-lived radioactive progeny, does not emit alpha radiation, and (iii) is 0.1 Bq/g, if the atomic number of the substance is greater than 81 and the substance, or its short-lived radioactive progeny, emits alpha radiation; or (c) in respect of more than one radioactive nuclear substance — except for Thorium 232, Uranium 235, Uranium 238 and their radioactive progeny mentioned in paragraph 4.3 of the IAEA Safety Standard RS-G-1.7 — is the