641. Arrangements for the control of radioactive substances, articles and equipment.

No person may intentionally or recklessly misuse or without reasonable excuse interfere with any radioactive substance1 or any electrical equipment to which the relevant regulations2 apply3.

Where a radioactive substance is used as a source of ionising radiation4 in work with ionising radiation5, the employer6 must ensure that, whenever reasonably practicable7, the substance is in the form of a sealed source8. The employer must ensure that the design, construction and maintenance9 of any article containing or embodying a radioactive substance, including its bonding, immediate container or other mechanical protection, is such as to prevent the leakage of any radioactive substance