Figure F18. Summary of spectral natural gamma ray measurements from downhole logging in Hole U1351B. SGR = standard gamma ray, CGR = computed gamma ray (gamma ray without uranium contribution). Both the SGR (higher values) and CGR (lower values) curves are plotted in green. The area between the two curves, also colored in green, shows the contribution of uranium, a common indicator of organic content. For details, see "Downhole logging."
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