Figure F20. Plots of natural gamma radiation (NGR) core logs from the uppermost 1.5 m of Hole U1366E. Each data point is integrated over 20 cm. Dashed lines show manganese nodule concentrations of 238U-series isotopes, 232Th-series isotopes, and their ratio. A. NGR count. B. Concentration of 238U-series isotopes. C. Concentration of 232Th-series isotopes. D. Ratio of 238U-series isotopes to 232Th-series isotopes.
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