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Article Dans Une Revue Journal of Environmental Radioactivity Année : 2020

Estimation of Fukushima radio-cesium deposits by airborne surveys: sensitivity to the flight-line spacing

Résumé

After Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, airborne gamma-ray detection was used for regional mapping of soil contamination. For such surveys, the flight-line spacing is an important factor controlling the quality of contamination maps. In this study, cesium-137 (137Cs) ground activity is interpolated and mapped using ordinary kriging method; thereafter the error of interpolation is evaluated as a function of flight-line spacing. The analyses were conducted in six 20 km × 20 km test sites with distance of less than 80 km from the FDNPP. In each site, the ordinary kriging estimators were applied to different selections of flight-lines of decreasing density, then punctual and classification errors were calculated. It is demonstrated that these variables are highly correlated (r2>0.78): increasing the flight-line spacing for 1 km increases the errors from 3% to 9%, depending on the site location. Therefore, flight-line spacing could be designed as a function of acceptable error, determined in the monitoring objectives.
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Dates et versions

hal-02929851 , version 1 (03-09-2020)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Pedram Masoudi, Mathieu Le Coz, Marc Andre Gonze, Charlotte Cazala. Estimation of Fukushima radio-cesium deposits by airborne surveys: sensitivity to the flight-line spacing. Journal of Environmental Radioactivity, 2020, 222, pp.106318. ⟨10.1016/j.jenvrad.2020.106318⟩. ⟨hal-02929851⟩
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