System and method for inspecting defects of structure by using x-ray

A method of detecting a defect in a wind turbine blade using a system comprising an X-ray generator that generates X-ray to be irradiated to the wind turbine blade, the X-ray generator being moved by a first transporting means;

• an X-ray detector that detects the X-ray generated by the X-ray generator and transmitted through the wind turbine blade, the X-ray detector being moved by a second transporting means;
• and a control unit, wherein the method comprises:
• dividing virtually, by the control unit, the wind turbine blade into a plurality of lengthwise sections based on a thickness profile thereof;
• receiving, by the control unit, a location of the X-ray generator;
• and
• controlling, by the control unit, output of the X-ray generator based on the location of the X-ray generator relative to the plurality of lengthwise sections,
• wherein the output of the X-ray generator is decreased for a section among the plurality of lengthwise sections that is farther from a hub of the wind turbine blade.