X-Ray
X-rays (x-radiation) are a type of radiation known as electromagnetic waves. When directed towards the body, the waves are able to produce black and white images of the body based on absorption. Bones absorb the most radiation and appear white in an x-ray image, while fat and soft tissues absorb less and appear grey. Hollow structures, like the lungs, appear black on an x-ray image because they contain air.
People think of x-rays when checking for broken bones although x-rays are also used to detect but not limited to, breast cancer, pneumonia and tuberculosis.
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