This publication addresses the chronology of events and circumstances of the radiological accident in Ventanilla, Peru, in February 2014. The information includes a detailed description of the international assistance provided by the IAEA, the health consequences and dose assessment for, and the medical management of the affected individual. This information and the lessons learned from the accident, relating to its circumstances, the notification, medical response, dose assessment and response at national and international levels are key aspects for Member States to consider when analysing their response procedures to radiological emergencies. The intention is to aid the and identification of necessary actions to be implemented in order to avoid or prevent potential similar accidents.