FREQUENTLY ASKED QUESTIONS
The following FAQs provide further information about our services:
Topic: Concrete X-Ray
After an X-ray radiation job is complete, will the concrete be radioactive for an extended amount of time?
No. The type of radiation we use does not cause other objects to become radioactive. The characteristics of the radiation we use are very similar to visible light, in that once it is in the secured position, it is essentially off.
Is there any type of license required to perform concrete X-ray?
Yes. Only companies licensed by the State of California’s Department of Health are permitted to perform concrete X-ray within the State of California. Subsurface Imaging, Inc. holds this license, and we are inspected annually by the department of health to ensure we are performing our operations in a safe manner.
Can concrete X-ray be dangerous to humans?
Yes. Like most tools, concrete X-ray can be harmful if not used properly. In order to eliminate potential harm, we implement four key safety precautions, along with the use of state-mandated radiation monitoring equipment.
Time – The less time exposed to radiation, the safer you are.
Distance – The farther away you are from a source of radiation, the safer you are.
Shielding – Utilizing objects such as walls, vehicles, and building materials provides a barrier of safety.
Use of Minimal Radiation - In our industry, ALARA stands for” as low as reasonably achievable.” We use the least amount of radiation necessary to complete the required project, thereby minimizing the amount of radiation exposure.
Topic: Ground Penetrating Radar (GPR)
Is GPR technology safe?
Yes, it is extremely safe. Our equipment is registered with the FCC and emits roughly the same amount of energy as your cell phone.
How deep can radar penetrate?
Our equipment is set up to inspect up to 18” of concrete from one side, 24” if used from both sides. Radar can’t penetrate steel, so if we are inspecting an area with a dense mat of steel, our depth will be reduced. Concrete that is newly poured (“green”) will have less than optimal depth penetration due to the moisture content.
Can GPR technology identify plastic conduit/pipe?
No. While some people will say yes, it is our professional opinion that because the make-up of plastic is very similar to that of concrete, GPR is not the ideal equipment to use to identify plastic conduit within concrete.
Can GPR technology differentiate between like or similar materials, such as rebar and post-tensioned cables?
No. Many inspection companies and even the manufacturers of GPR equipment will say the answer is yes. However, It is our professional opinion that at present, concrete X-ray is the best way to accurately differentiate between similar materials.
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