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The middle bed was made approximately twice as radioactive as a typical midcontinent US shale, resulting in the zone containing 13 ppm uranium, 24 ppm thorium, and 4% potassium.


LaTeX Math Inline
body1 \ {\rm GAPI} = 0.005 \cdot (GR_{RA} - GR_{NRA})

where

LaTeX Math Inline
bodyGR_{RA}
 is GR tool reading against radioactive part of Calibration Stand

LaTeX Math Inline
bodyGR_{NRA}
 is GR tool reading against non-radioactive part of Calibration Stand