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Ground penetrating radar is limited chiefly by

  • A.rapid attenuation in clay and saturated ground
  • B.an inability to detect any buried object at all
  • C.requiring a borehole at each survey point
  • D.giving results only below about fifty metres depth

Answer: A

Correct answer: rapid attenuation in clay and saturated ground

Radar depends on the ground being electrically resistive, and clay and saline water are conductive: they absorb the signal within a metre or two. In dry sand or clean gravel the same equipment reaches ten metres or more. Penetration is therefore governed by the material rather than by the instrument, which is why a trial line is worth running before the survey is planned.

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