The aim of this publication is to provide practical guidance for the first responders who will respond during the first few hours to a radiological emergency and for the national officials who would support this early response. This publication provides guidance in the form of action guides, instructions and data that can be easily applied by a State to build a basic capability to respond to a radiological emergency. Also available in Arabic, French, Russian and Spanish: https://www-pub.iaea.org/books/IAEABooks/7606/Manual-for-First-Responders-to-a-Radiological-Emergency