Administrative Regulations for Radioactive Material and Equipment Capable of Producing Ionizing Radiation and Associated Practice Article 3
Sealed radioactive materials are classified into five categories based on their potential hazard to human health and the environment, as listed in Table I.Table I：Categories of Sealed Radioactive Material.PDF
中文原文 放射性物質與可發生游離輻射設備及其輻射作業管理辦法第3條
密封放射性物質按其對人體健康及環境之潛在危害程度，依附表一所列活度分為五類。