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TitleInspection of a restricted access site using UAV perimeter survey with the ARDUO direction-capable gamma spectrometer
AuthorSinclair, L EORCID logo; Chen, C MORCID logo
SourcePure and Applied Geophysics 2020 p. 1-10,
Alt SeriesNatural Resources Canada, Contribution Series 20190316
Mediapaper; on-line; digital
File formatpdf; html
Subjectsgeophysics; Science and Technology; Government and Politics; geophysical surveys; radiometric surveys, airborne; gamma-ray surveys, airborne; gamma-ray spectrometers; nuclear explosions; radioactivity; Comprehensive Nuclear-Test-Ban Treaty; Advanced Radiation Detector for Unmanned Aerial Vehicle Operations (ARDUO); drones
Illustrationsphotographs; 3-D diagrams; satellite images; tables; spectra; geoscientific sketch maps
ProgramCanadian Hazard Information Service Nuclear Emergency Response
Released2020 09 25
Under the Comprehensive Nuclear-Test-Ban Treaty a State Party may request an on-site inspection to establish whether a nuclear explosion has taken place. Gamma spectroscopy survey is key to on-site inspection and aerial radiometric survey has been demonstrated to provide efficient coverage of large areas. We have developed the Advanced Radiation Detector for Unmanned Aerial Vehicle (UAV) Operations(ARDUO). This gamma spectrometer is direction-capable; it can point out the direction toward a source of radioactivity while in flight. We have collected data with the ARDUO detector flown over one or two point radiation sources in a grid survey covering 5,000 m2. With this data we demonstrate how directional techniques can be implemented in mobile aerial survey to improve the spatial precision of the resulting radioactivity map. In particular, in an on-site inspection, an Inspected State Party may declare up to 50 km2 of restricted-access sites, each of area up to 4 km2. We show how perimeter survey outside of a restricted-access site with the direction-capable ARDUO detector permits a reconstruction of the distribution of radioactivity within the no-fly zone.
Summary(Plain Language Summary, not published)
Under the Comprehensive Nuclear-Test-Ban Treaty a country that has ratified the treaty can request an on-site inspection of a site where a nuclear explosion is suspected to have taken place. However, the inspected country is allowed to declare some area to be off-limits to the inspectors. We developed a radiation detector called ARDUO which can point in the direction of a source of radioactivity. In this paper we show that using the ARDUO detector in a mobile survey around the perimeter of an area which is off-limits, inspectors would be able to see whether there is radioactivity in the off-limits zone, and also determine approximately the location where the radioactivity is coming from.

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