Factorial kriging for estimating and mapping the geochemical background from in situ gamma dose rate measurements downstream of a former uranium mine - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Environmental Radioactivity Année : 2021

Factorial kriging for estimating and mapping the geochemical background from in situ gamma dose rate measurements downstream of a former uranium mine

Résumé

A geostatistical approach is applied for extracting the geochemical background from gamma dose rate data acquired downstream of a former French uranium mining area. The exploratory data analysis shows that the spatial structure of the gamma dose rate consists of two components: a short isotropic component (10 m-range) that corresponds to the geochemical background; and a long anisotropic component (30–60 m-range) that corresponds to the drainage network features previously fed by the mine discharge water. The gamma dose rate on the whole area of interest was estimated and simulated (to deal with uncertainties) through a kriging of the measured values. The spatial component related to the geochemical background was then extracted through factorial kriging. The proportion of the gamma dose rate explained by the geochemical background according to factorial kriging is consistent within uncertainties with geochemical analyses performed on soil and sediment samples. This study thus highlights the potential of such geostatistical approaches for better exploiting radiometric data.
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Dates et versions

hal-03364719 , version 1 (04-10-2021)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Citer

Mathieu Le Coz, Alkiviadis Gourgiotis, Pascale Blanchart, Arnaud Mangeret. Factorial kriging for estimating and mapping the geochemical background from in situ gamma dose rate measurements downstream of a former uranium mine. Journal of Environmental Radioactivity, 2021, 237, pp.106681. ⟨10.1016/j.jenvrad.2021.106681⟩. ⟨hal-03364719⟩
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