Simulation and tests for the characterization of the response of the detection system fora UAV system

The present thesis project consisted in the testing of a gamma rays and neutron detectormounted on an UAV (Unmanned Aerial Vehicle). The detector is a CLLB (Cs2LiLaBr6), which is a gamma-neutron scintillation detector. This one was tested separately in order to determine its response to different gamma radiation sources in different conditions. After the experiments with the gamma sources, neutron sources were employed in order to test the neutron detection and capability of the CLLB. The detection system (CLLB detector + digitizer) was mounted in the drone (UAV) for a simulation of a typical surveillance flight of the UAV, and again to observe and analyze the detection response before a gamma source in motion. For each test with the gamma sources, simulations of the detector and its features were performed with the software GEANT4 in order to compare them with the results obtained experimentally. Additionally, experiments with silicon photomultipliers (SiPM) coupled to CsI and SrI detectors were performed in order to quantify their resolution and compare the values obtained between them, and the resolution values obtained with the CLLB detector.