Coupled use of Sr and Ra isotopes to assess Ra mobility and water-rock interaction in sandstone aquifers Vinson, David S. ; Lundy, James R. ; Dwyer, Gary S. ; Vengosh, Avner Abstract Publication: Geochimica et Cosmochimica Acta Supplement Pub Date: June 2009 Bibcode: 2009GeCAS..73Q1387V