Nuclear & Radiation Events Drone Guide

Nuclear and radiological incidents present some of the most challenging environments faced by emergency responders. Events involving nuclear power facilities, radioactive materials, industrial sources, transportation accidents, fires, natural disasters or other radiological emergencies can potentially create areas where sending personnel to investigate may expose them to unnecessary risk. During these events, authorities need accurate information quickly. Emergency teams may need to understand conditions around buildings and infrastructure, determine whether radioactive material has been released, map affected areas, inspect damaged facilities and monitor how conditions change over time. Drones provide an important remote-monitoring capability. Specialist uncrewed aircraft can carry radiation detectors, high-resolution cameras, thermal sensors, LiDAR and environmental monitoring equipment. Instead of immediately sending personnel into potentially contaminated or high-radiation areas, drones can collect information remotely under the control of appropriately authorised emergency teams. Drones do not replace radiation-protection professionals, emergency responders or established nuclear monitoring systems. Their primary value is extending the reach of these specialists while helping reduce unnecessary human exposure. ## **What Is a Nuclear or Radiological Drone?** A nuclear or radiological drone is an uncrewed aircraft equipped to support monitoring or inspection within appropriately authorised radiological environments. Depending on the mission, the aircraft may carry: - Gamma radiation detectors - Dosimeters - Spectrometers - High-resolution RGB cameras - Thermal cameras - LiDAR - Environmental sensors - Air-sampling equipment Different aircraft and payload combinations are required for different missions. The objective may be radiation mapping, infrastructure inspection, environmental assessment or emergency situational awareness. ## **Radiation Mapping** Radiation mapping is one of the most important drone applications during radiological events. A drone carrying a suitable detector can collect measurements while travelling through predefined survey areas. Each measurement can be associated with the aircraft’s position. Specialist software can then create a geographically referenced radiation map. This allows qualified teams to understand how measured radiation levels vary spatially without requiring personnel to physically survey every location. ## **Gamma Radiation Detection** Gamma radiation can be monitored using specialist detectors integrated with suitable drones. The sensor records measurements while the aircraft performs its authorised survey. Positioning information allows measurements to be mapped geographically. Interpretation requires radiation-protection expertise because sensor type, altitude, shielding, background radiation and environmental conditions can influence measurements. ## **Radiation Spectrometry** Some specialist payloads can provide spectrometric information in addition to measuring radiation intensity. Spectrometry can help qualified specialists characterise detected radiation and support identification of radionuclides under appropriate conditions. These payloads can be heavier and more complex than basic radiation detectors. The aircraft, sensor and survey methodology therefore need to be selected according to the monitoring requirement. ## **Protecting Emergency Responders** One of the strongest reasons for using drones during radiological emergencies is reducing unnecessary personnel exposure. Traditionally, some assessments require teams to approach an area carrying radiation-monitoring equipment. A drone can provide an initial remote survey. If elevated readings or hazardous conditions are identified, emergency managers can use the information when planning subsequent actions. Human entry may still be required, but the team can approach the situation with better information. ## **Nuclear Power Plant Emergency Assessment** Nuclear power facilities contain large and complex infrastructure. Following an earthquake, flood, fire, severe storm or other emergency, operators may need rapid information about external facility conditions. Drones can provide aerial imagery of suitable areas. High-resolution cameras can document buildings, roofs, external equipment, roads and surrounding infrastructure. Radiation detectors can provide additional information where appropriately deployed. ## **Structural Damage Assessment** A nuclear or radiological event may also involve structural damage. Drones can inspect suitable external buildings and structures without requiring personnel to immediately approach every area. RGB imagery provides detailed visual information. LiDAR and photogrammetry can create three-dimensional models. These datasets can support qualified structural and emergency specialists assessing the site. ## **Thermal Imaging** Thermal cameras provide information about surface-temperature patterns. During suitable emergency assessments, thermal imagery can help authorised personnel understand heat distribution around accessible external infrastructure. This can complement conventional imagery and fixed facility instrumentation. Thermal information does not measure radiation and should not be interpreted as a radiation detector. ## **Radioactive Contamination Mapping** Radiation level and radioactive contamination are related but distinct concepts. Specialist drone surveys can help teams identify spatial radiation patterns that may indicate areas requiring contamination investigation. Ground sampling may still be necessary to determine actual contamination levels and radionuclide concentrations. Drone information can help specialists decide where those samples should be collected. ## **Environmental Monitoring** Radiological events can potentially affect surrounding land and water. Drones can support authorised environmental monitoring across suitable areas. Aerial imagery can document land conditions while radiation sensors collect measurements. Specialist systems may also support air or environmental sampling. The resulting information can be combined with laboratory analysis, fixed monitoring stations and ground surveys. ## **Air Sampling** Specialised drones can potentially carry lightweight air-sampling equipment. These systems can collect samples from predefined authorised locations. Samples can subsequently be analysed using appropriate laboratory methods. This can help monitoring teams collect information from locations that may be difficult to access from the ground. ## **Water Sampling** Radiological monitoring may also require water samples. Specialist drone systems can potentially collect samples from suitable lakes, reservoirs, rivers or other water bodies. The drone provides access while reducing the requirement for personnel to enter every sampling location. Laboratory analysis remains necessary to determine the presence and concentration of specific radioactive materials. ## **Ground Sampling Support** Drone radiation maps can help environmental teams determine where ground samples should be collected. Rather than sampling a large area uniformly, teams can use aerial information to prioritise locations. Samples of soil, vegetation or other materials can then be collected using appropriate professional procedures. This makes ground-monitoring programmes more targeted. ## **Natural Disaster Damage to Nuclear Facilities** Earthquakes, floods, tsunamis, wildfires and severe storms can affect energy infrastructure. Where a nuclear facility is involved, drones can potentially support both conventional disaster assessment and radiological monitoring. A single aircraft could collect visual imagery while carrying appropriate environmental sensors. Different teams can then use the resulting information for infrastructure, emergency and radiation-protection assessments. ## **Fire Monitoring** Fires at facilitie