The “X” in X-ray stands for the unknown , just as x stands for an unknown quantity in mathematics. During World War I, X-rays were already being used for medical purposes, including locating bullets in the human body.
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X-rays are a type of radiation called electromagnetic waves . X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white. This is because different tissues absorb different amounts of radiation.
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