Brannon and Osoba reported in 1955 on the introduction of the scintillation counter into field use for gamma-ray well logging has provided a new tool with special utility for the determination of natural radioactivity of sediments. Previous subsurface gamma-ray measurements have indicated only the total amount of radioactivity of the sediments.
Typical Gamma-Ray Spectrum
With the scintillation counter, the relative amounts of the elements which emit gamma radiation can be determined. Sediments logged included 35 zones in wells located in the Texas Gulf Coast, East Texas, and West Texas. Although the data obtained from measurements made to date are not sufficient to evaluate the possibilities of spectral logging, it appears likely that spectral measurements will yield information of geologic value.
The authors concluded that from the work described in this report, it may be concluded that with available scintillation logging equipment, the gamma rays from potassium and from the uranium and thorium series can be resolved sufficiently to permit determination of relative concentrations of these elements,
if the elements are uniformly distributed in the formation.
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