Ionising radiation is radiation that possesses enough energy to free electrons from atoms or molecules. Ionising radiation can be in the form of either particles or electromagnetic waves. There are many sources of ionising radiation: natural radioactive substances such as radon, and artificially produced radioactive substances or radiation such as X-rays or neutron beams produced by the use of certain electrical equipment. Exposure to ionising radiation is harmful to health and potentially lethal.

This topic describes that before commencing work involving ionising radiation, an assessment of the risk to employees and other persons must be carried out. The employer should use this information to identify the controls needed to restrict exposure to ionising radiation.

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