Fig. 1: Ranges of relative concentration of tritium in groundwater in the Sahel region of Africa (n = 1,184).
From: Groundwater vulnerability to pollution in Africa’s Sahel region
These concentrations were measured between 2010 and 2016 as part of the completed International Atomic Energy Agency RAF7011 project42, which was independent of this study (frequency of measurements by year in the upper right). Tritium is classified here in relation to the estimated modern background (bg) concentration in precipitation from the most recent global model25. The area in grey indicates the extent of the area modelled. The countries containing data are labelled with the following abbreviations: BF, Burkina Faso; BN, Benin; SN, Senegal; TG, Togo.
