Multiphase flow meters (MPFMS) are used across the industry to measure production fluids (oil, water, and gas) to perform the allocation per well. However, some of the fields/reservoirs have seawater injection, which changes the composition of produced water over time. At the beginning of the life field will have 100% formation water (higher salinity) and over the time the mixing with sea water will reduce the overall salinity until you have 100% seawater. The 81 keV and 32 keV are the energy bands from Gamma-ray emitted from a radioactive source of Barium 133 used in the MPFMs.
This may help you:
https://www.nist.gov/pml/x-ray-mass-attenuation-coefficients
For mixtures of differing composition you can follow the procedure near the end of this:
https://physics.nist.gov/PhysRefData/XrayMassCoef/chap2.html
For elements of "similar" Z, the attenuation coeff is similar, so the values will scale roughly with density so it seems that telling one salinity from another might be quite difficult.
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