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, Author Contributions O.R. and C.V. designed research; O.R. and OE wrote the main manuscript

O. E. , S. H. , N. S. , K. O. , O. et al., conducted sampling and field measurements; B.S. and A.d.R. performed land-use mapping; O.E. and I.L. conducted gamma spectrometry analyses; G.L. conducted the statistical analyses on hydro-sedimentary data