X-ray Lead Aprons
Some people wonder why lead aprons are used in X-ray departments by the tech. The reason is because X-ray lead aprons are designed to block the X-ray photons so they don't enter your body. This works because the atoms of lead are very dense and the X-rays are not able to penetrate through. The thickness of the X-ray lead shielding is usually .25mm or .50mm depending on the application and strength of the X-ray beam.
Some exams will not allow lead shielding due to the area of intrest being in a place that the lead would interfer with. Seeing the body part is the reason for the exam and the lead can not block the path of the X-ray beam.
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