Introduction?The growing sophistication, availability and adaptability of Uncrewed Aerial Systems (UASs) have made them an emerging capability both for nuclear safety and nuclear security applications, such as monitoring a radioactive contamination area and locating a radioactive source out of regulatory control. From military application to recreational use, modern UASs come in a wide range of sizes, shapes, cost, and capabilities. A greater understanding is needed regarding their use to support countries’ radiological and nuclear security programmes.This webinar is part of a series of events that address the need for improved research, development, training, testing and guidance on UASs applications for nuclear security. Following a recent Technical Meeting on the Use of UAS for Radiation Detection and Surveillance, this event will address specific applications in greater detail.Guest speakers will present four cases of UASs use: emergency response, environmental survey and monitoring, radioactive source search, and a special maritime application. The cases in which this technology is used will provide a context for determining when UAS technology is applicable for a specific activity and identify potential UASs requirements. Each use case presentation will discuss key mission requirements, why a UAS was used, environmental constraints, salient UASs capabilities, lessons learned, and conclude with considerations for other similar cases.ObjectivesThe main objective of the webinar is to provide and discuss details for a diverse set of scenarios or cases in which UASs could be used to support specific radiological or nuclear security programme activities. A secondary objective is the identification of specific areas for which Member States require further information and investigation.