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GPR scans and X-rays are top competitors in subsurface imaging, both having the ability to pass through asphalt, soil, and even concrete. Both systems are used in various applications and bring their own list of benefits as well as drawbacks. So, if the decision is yours, what do you pick? That is where knowledge of the strengths and limitations of each can be beneficial. Be it concrete scanning, utility detection, or tank detection, knowledge of how to use a GPR scan versus X-ray technology is invaluable in terms of saving time and costs.
A Ground Penetrating Radar (GPR) sends radio waves of high frequency to detect an object underground. It is nonintrusive, real-time, and very flexible information. GPR can detect metal, plastic, concrete, voids, and moisture. Being non-radiative, it is perfect for indoor and public applications. Unlike X-ray, it is possible to scan just one side of a slab or surface, which is especially useful when working in areas of limited access.
X-ray scanning is achieved by placing a radiation source on one surface of an object and a detector on the opposite side. X-ray beams pass through material and highlight the differences in structure density, making high-quality images of objects within, such as rebar, pipes, or post-tension cables. This technology is accurate in measuring the position and depth of metallic objects, but it does have its limitations. X-ray requires access on two sides of an object, uses radiation safety measures for exposure, and generally takes more setup time than a GPR scan.
One of the most prominent areas where a GPR scan is superior is in terms of speed. Because it can be conducted on one side of an object without detectors or radiation shielding, it is the faster, more efficient choice in most instances. GPR can also scan multiple locations faster, which is beneficial in mapping utilities or detecting underground tanks on large properties. On the other hand, X-ray imaging will provide you with marginally better images for metal components, but the nature of the process makes it a slower process. You’ll also have to evacuate the area when scanning to avoid exposure, which can delay other parts of a project.
GPR technology has no radiation risk, making it the preferred choice for scanning schools, hospitals, residential structures, and inhabited commercial structures. A GPR scan can be conducted during the workday without shutting down operations or relocating individuals off-site. X-ray imaging, however, requires stringent safety procedures and can sometimes be done after hours or in an empty building. That can impact the budget as well as the overall project timeline.
Ultimately, the choice comes down to project specifications. If you require fast, non-destructive testing capable of mapping metallic as well as non-metallic objects, GPR is the choice for you. It is ideal for applications under open air, with rough surfaces, or in areas of restricted access.
But if the aim is to detect the exact depth and position of metallic objects in an extremely localized area, and both sides are accessible, X-ray scanning is worth trying. In most cases, the two can be combined for maximum visibility: GPR scan for a general overview and an X-ray for the close-up.
Working with both technologies requires expert hands, which we provide at West Coast Tank Recovery. We specialize in using the most advanced GPR scanning technology to offer our clients fast, safe, and accurate outcomes. Reach out to our team to learn more about what’s under your property!