Fig. 2From: Radon emanation and heavy-metals assessment of historical warm and cold springs in Nigeria using different matricesa Bar chart of readings and spectrum for Ni, Cd, Cu and Pb in selected points in cold spring. b Bar chart of readings and spectrum for Fe in selected points in cold spring. c Bar chart of readings and spectrum for Ni, Cd, Cu and Pb in selected points in warm spring. d Bar chart of readings and spectrum for Fe in selected points in warm springBack to article page