Provided are methods of detecting X-rays, a photographing methods using the X-ray detecting method and/or an X-ray detector using the methods. For example, one method of detecting X-rays includes radiating a first X-ray, removing, by a first X-ray detection unit, a first electric charge generated by the radiated first X-ray, and outputting, by a second X-ray detection unit adjacent to the first X-ray detection unit, a voltage corresponding to the first X-ray.