This precision quality control tool 37 731 is ideal for daily, weekly and monthly quality control assessments of all mechanical and geometrical parameters of linear accelerators or teletherapy units. The Precision Isocentric Beam Checker II consists of a large opaque acrylic screen backed by a secondary plate, both supported by two uprights. The screen is inscribed with lines precisely defining the corners, edges and center of the screen’s 10 x 10 cm and 20 x 20 cm fields. Intersecting center lines are inscribed with short lines spaced 1 cm apart. The screen can rotate about its axis in increments of 45°. Tungsten markers of 2 mm in diameter are embedded in the center and corners of the fields. A 10 x 12 inch ready-pack film can be sandwiched between the two plates. When
