Calibration and Analysis of Borehole and Formation Sensitivities For Gamma Ray Spectroscopy Measurements with Multiple Radioactive Tracers


L.L. Gadeken, H.D. Smith, Jr. and D.J. Seifert,

28th Annual SPWLA Symposium
in London, England June 29 – July 2, 1987



Gamma ray spectroscopy tools are significantly expanding the use of multiple radioactive isotopes in monitoring downhole operations. These tools measure the energies of the gamma rays which are emitted by radioactive tracers placed in the well being logged. A multi-tracer survey log is obtained by deconvolving the gamma ray spectral data into contributions from each individual isotope as a function of depth.