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RadiaCopter - UAS Gamma spectrometry for detection and identification of radioactive sources

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(1)RadiaCopter. UAS Gamma Spectrometry for Detection and Identification of Radioactive Sources. Detector evaluation results. Introduction This project aims to develop a gamma-ray spectrometry system with an unmanned aircraft system (UAS). This system fills a gap between portable measurement systems and full-sized airborne systems, and complements the car-borne measurement systems. Sources can be approached closely, providing good sensitivity with a relatively small instrument. The. Magnus Gårdestig Håkan B.L. Pettersson. operating range allows for measurements to cover a large area in less time than e.g. portable systems. Urban environments are applicable. A test flight with the microdrone MD4-1000 [1] was performed in 2011 [2] UAS of this size can carry a payload mass of about 1 kg, which limits the choice of detectors. The evaluation of a candidate detector is presented here.. Count rates at the full energy peaks at 364.5 keV (131I) and 661.6 keV (137Cs) [5].. iGEM MDA (137Cs) MDA (131I). 38 MBq 19 MBq. Covered area 0.25 km2 Line spacing 10 m Speed 5 m/s Altitude 5m Total distance 25500 m Total time 85 min. GR-135 MDA (137Cs) MDA (131I). 8 MBq 4 MBq. Applications • • • •. Survey NPPs Search for orphan sources Secure public areas Identify sources with high dose rate • Survey accident sites • Survey container sites • Geophysical surveys. Conclusions The iGEM Spectroscopy System is a good candidate for a UAS detector, even if a NaIbased system is more efficient. The small size and light weight make it possible to complete the system with e.g. additional detectors, camera, collimator and air sampler. Good search strategies can compensate for less efficiency.. The UAS also provides footage of the source and site.. Future Work. Detector evaluation The iGEM Spectroscopy System [3] was considered a suitable detector given the low weight (288 g) and the turnkey configuration. The system uses a CdZnTe detector. The evaluation approach was to calculate the MDA for a given speed and altitude for the system. Count rate efficiencies were measured with two sources (137Cs and 131I) to. cover a wider energy range. The count rates at specific positions passing a point source were calculated by distance and air attenuation. A scenario was setup to give an idea of the detection limit for the system. The detector was compared with a handheld RIID, the GR-135 [4], with a 4 cu. in. NaI detector.. References [1] microdrones GmbH, www.microdrones.com [2] test flight, youtu.be/HTlUOIsDbio QR code → [3] Endicott Interconnect Technologies, Inc. www.evmicroelectronics.com/igemsm.html [4] SAIC Exploranium GR-135 www.saic.com/products/security/gr-135/ [5] Nuclear Data Center, Korea Atomic Energy Research Institute, atom.kaeri.re.kr [6] Scandicraft AB Future Vechicle Development, www.scandicraft.se [7] Kock, P; Finck, Robert R.; Nilsson, J. M.C.; Östlund, K.; Samuelsson, C. A deviation display method for visualising data in mobile gamma-ray spectrometry. Applied Radiation and Isotopes 68 (2010) 1832–1838 Image in the background [1]. • Aircraft vehicle evaluation • Scandicraft [6] • Detector evaluations • Multidetector system • β/n detection • Air sampling • Search strategies • Validation • Exercises • Calibrations • Data management and presentation • Deviation display [7] • Presentation in Google Maps/Earth • Info sharing • Monte Carlo simulation of the system. Acknowledgements The authors thank Graeme Catto at GC Technology GmbH for providing the detector for testing.. magnus.gardestig@liu.se, Radiation Physics, Linköping University, Sweden, sites.google.com/site/radiaprojects/radiacopter, 2012.

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