This handbook, published by the International Atomic Energy Agency (IAEA), provides comprehensive technical guidance on the design of physical protection systems for nuclear material and facilities. It forms part of the IAEA Nuclear Security Series, which offers international consensus guidance to help States fulfill their nuclear security obligations. The publication outlines key functions of a protection system, such as deterrence, detection, and response, and covers design, evaluation, and management of these systems. It aims to support States in implementing effective security measures to protect nuclear materials in various contexts, including domestic use and international transport. The guidance draws on the practical experiences of IAEA Member States and aims to enhance global nuclear security by promoting international best practices. |