This document provides an overview of legislative requirements for the use of ionizing radiation in medical purposes under the Atomic Energy Licensing Act 1984 (Act 304) in Malaysia. It discusses the purposes of the Act, introduction, Act and subsidiary regulations, control and licensing, radiation protection systems, dose limits, decommissioning, quality audit management, current issues, and circulars/guidelines. The key objectives are to ensure protection and safety from ionizing radiation effects for the environment, public, occupational workers, and patients by optimizing use and quality through good regulatory practice.