High Quality Content by WIKIPEDIA articles! Hydraulic fracturing is the propagation of fractures in a rock layer by pressurized fluid. Induced hydraulic fracturing or hydrofracking, commonly known as fracking, is a technique used to release petroleum, natural gas (including shale gas, tight gas and coal seam gas), or other substances for extraction.Radionuclides are associated with hydraulic fracturing in two main ways. Injection of man-made radioactive tracers, along with the other substances in hydraulic-fracturing fluid, is often used to determine the injection profile and location of fractures created by hydraulic fracturing. In addition, hydraulic fracturing releases naturally occurring heavy metals and radioactive materials (NORM) from shale deposits, and these substances return to the surface with flowback, also referred to as wastewater. When NORM is concentrated or exposed by human activities, such as hydraulic fracturing, it is classified as TENORM (technologically enhanced...

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