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GW Combination Probe

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1 McOHM-EL   Geologger-GWS System & GW Combination Probe

The Geologger-GWS has been designed to provide simultaneous execution of Natural gamma log and electric log through its GW Combination Probe (Model-3493).
Natural gamma log and electric log are very useful means for groundwater survey because these logs can discriminate between permeable layers such as gravel layer and sandstone layer, high in percentage of porosity, and impermeable layers such as clay and shale layers. Porosity is presented by intensity of resistivity. Impermeability closely relates to the volume of clay contained in a layer, and the higher the potassium (k) content in the clay is, the higher the Natural gamma ray intensity is.

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  製品のトラブル  
     
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● For water well loggings, both Electric log and Natural gamma log are those required for evaluation of
　water bearing layers.

● GW combination log is of combination type, and its single probe is able to conduct these logging
　simultaneously.

● With its easily settable measurement by ‘Menu-driven operation’ and ‘Auto-ranging’, it facilitates anyone
　to utilize the same.

● The measurement items are four, composed of Normal resistivity for 16” and 64” spacing, SP and
　Natural gamma by one logging run.

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  ■ Natural gamma
     
1   Detecto
Size		 ：Nal (TＬ)
：1/2” dia. x 2” long
     
  ■ Normal resistivity
    Spacing
Electrode		 ：16” and 64”
：stainless steel
     
  ■ SP
    SP ：common with potential electrode for 16” spacing
       
  ■ Physical  
    Physical ：40 mm dia. x 170cm, 6.1kg
     
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Data sheet
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■ Application
  • Evaluation of producibility for the water well.
  • Determination of optimal location of screen in tubewell design.
  • Investigating the strata in ground water field,
  • Checking the salinity of ground water.
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E-mail ：seihin@oyo.jp