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We measured X-ray absorption and scatter with an acrylic plate attached to the front of the X-ray beam limiting device. The acrylic plate played the role of an added filter, absorbing the low energy element of the X-ray beam and decreasing the surface dose to 4.3% of the extreme height as a result. However, the surface dose outside the irradiation field increased to 35.3% of the extreme height, and the scatter dose increased to 47.8% of the extreme height. An acrylic plate with the minimum thickness necessary should be used to decrease unnecessary exposure outside the irradiation field.

Absorption and Scatter with an Acrylic Plate Attached to the Front of an X-ray Beam Limiting Device