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Table T5. Acronyms and units used for downhole wireline tools and measurements, Expedition 341.

Tool Output Description Unit
EDTC   Enhanced Digital Telemetry Cartridge  
  GR Total gamma ray gAPI
  ECGR Environmentally corrected gamma ray gAPI
  EHGR High-resolution environmentally corrected gamma ray gAPI
HNGS   Hostile Environment Natural Gamma Ray Sonde  
  HSGR Standard (total) gamma ray gAPI
  HCGR Computed gamma ray (HSGR minus uranium contribution) gAPI
  HFK Potassium wt%
  HTHO Thorium ppm
  HURA Uranium ppm
APS   Accelerator Porosity Sonde  
  APLC Near/array limestone corrected porosity Dec. fraction
  STOF Computed standoff inch
  SIGF Formation capture cross section Capture units
HLDS   Hostile Environment Litho-Density Sonde  
  RHOM Bulk density g/cm3
  PEFL Photoelectric effect barn/e
  LCAL Caliper (measure of borehole diameter) inch
  DRH Bulk density correction g/cm3
HRLA   High-Resolution Laterolog Array  
  RLAXXX Apparent resistivity from Computed Focusing Mode XXX Ωm
  RT True resistivity Ωm
  MRES Borehole fluid resistivity Ωm
MSS   Magnetic Susceptibility Sonde  
  LSUS Magnetic susceptibility, deep reading (DR) Uncalibrated units
  HSUS Magnetic susceptibility, high resolution (HR) Uncalibrated units
FMS   Formation MicroScanner  
  C1, C2 Orthogonal hole diameters inch
  P1AZ Pad 1 azimuth °
    Spatially oriented resistivity images of borehole wall  
GPIT   General Purpose Inclinometry Tool  
  DEVI Hole deviation °
  HAZI Hole azimuth °
  Fx, Fy, Fz Earth's magnetic field (three orthogonal components) °
  Ax, Ay, Az Acceleration (three orthogonal components) m/s2
DSI   Dipole Shear Sonic Imager  
  DTCO Compressional wave slowness µs/ft
  DTSM Shear wave slowness µs/ft
  DT1 Shear wave slowness, lower dipole µs/ft
  DT2 Shear wave slowness, upper dipole µs/ft
VSI   Versatile Seismic Imager  
  1WTT Acoustic traveltime s
DIT   Phasor Dual Induction–Spherically Focused Resistivity Tool  
  IDPH Deep induction resistivity Ωm
  IMPH Medium induction resistivity Ωm
  SFLU Shallow spherically focused resistivity Ωm

For the complete list of acronyms used in IODP and for additional information about tools, consult IODP-USIO Science Services, LDEO, at

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