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X-RAY, having some advantages, in the long run does not stack up to the advantages of GPR.  The table below offered by GSSI is a great quick comparison between the two.

 

Radiography
(X-Ray)
StructureScan® by DCI
Your Cost High Low
Access Required 2 sides 1 side
Set-up Time Long 5 minutes
Data Collection Process 1 film at a time 2' x 2' collection pad
in 8 minutes
Real-time Inspection Results No Yes
Data Storage Medium Film / Digital Digital 3D
Consumables Required Yes No
Licenses Required Yes No
Has Hazards (radiation) Yes No
Large Area Data Collection Method Step and Repeat Continuous
Must Process to Get Results Yes Optional
Can Determine X-Y Location With calculations Direct readout
Can Determine Exact Z (depth) Location With calculation Direct readout
 
 

 

 

     

Above:  X-Ray film outlines.

This example demonstrates that x-ray is not user friendly.  In the morning when the contractor comes in, they are left with a stack of film to decipher.  If there is something in the way of a core, then the x-ray techs need to come back out, and shoot another spot.  Compare this technique to GPR.

 

   Above:  GPR survey lines.

This example demonstrates how quick and easy GPR is.  Not only is GPR safe during working hours, but if there is something that is in the way of the core, then the GPR survey shows where it is in real-time.  No need to re-shoot another film.  Plus, since GPR only needs ONE SIDE to survey, there is no re-set up time needed.