Measurement of flowing water salinity within or behind wellbore casing
 Water flowing within or behind a wellbore casing is irradiated with 14 MeV neutrons. Gamma radiation from the isotope nitrogen 16 induced from the O.sup.16 (n,p) N.sup.16 reaction and either the Na.sup.23 (n,.alpha.)F.sup.20 or the Cl.sup.37 (n,.alpha.)p.sup.34 reaction is measured in intensity and energy with detectors in a downhole sonde. From the gamma radiation measurements, the salinity of water flowing either within or behind wellbore casing may be determined. 
Texaco Inc.
E G G G G
E21B G01N G01V G01N G01N
inventional additional inventional additional inventional
Dan M.
Arnold