B bcgold Well-known member Joined Mar 22, 2016 Messages 66 Aug 21, 2018 #1 Sample of clay taken from surface
L Lino1406 Well-known member Joined Nov 1, 2007 Messages 2,356 Location Israel Aug 22, 2018 #2 Yes if you're interested in uranium (samples 3-4). And get Geiger counter