Radiologic Technologist Practice Exam

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Which of the following represents a type of primary shielding?

Lead apron
Shadow shield
Shaped contact shield
Collimation

The correct answer is: Collimation

The correct choice refers to collimation as a type of primary shielding. Collimation is an important radiologic technique that involves controlling the shape and size of the X-ray beam. By narrowing the beam to the area of interest, collimation minimizes the exposure of surrounding tissues to ionizing radiation, effectively reducing unnecessary radiation dose. This regulatory measure is considered primary shielding because it obstructs the radiation before it reaches the patient or radiographer, thus protecting both parties from excess exposure. In contrast, a lead apron, shadow shield, and shaped contact shield are categorized as secondary shielding measures. These methods are designed to protect against stray radiation after it has already been produced, rather than controlling the initial beam itself.