What shape of lead collimator is preferred in radiation safety?

In radiation safety, a rectangular lead collimator is preferred because it provides the ability to focus and shape the radiation beam more effectively in a controlled manner. This shape allows the collimator to match the dimensions of the imaging area or the treatment field more closely, which is essential in minimizing radiation exposure to surrounding tissues. By optimizing beam shape and size, a rectangular collimator reduces scatter radiation, enhances image quality, and contributes to better patient safety and diagnostic accuracy.

Additionally, rectangular collimators facilitate alignment with the anatomical features of the patient, which can be essential for accurate treatment delivery in therapeutic applications. The other shapes may not provide the same level of control or precision needed in radiation applications, making the rectangular design the preferred choice in radiological practices.