Which of the following is not required on mobile fluoroscopic equipment?

The correct answer centers on the requirements established for mobile fluoroscopic equipment. Automatic brightness control (ABC) is not a mandated feature for mobile fluoroscopy machines. While ABC enhances image quality by automatically adjusting the x-ray tube output based on the patient's density, it is not specified as a necessity for the operation of mobile units.

In contrast, other components such as a device to prevent operation without a primary barrier, a device to prevent operation at close source-to-skin distances, and an image intensifier are integral to ensuring safety and efficacy during fluoroscopic procedures. These features are emphasized to protect both patients and operators from unnecessary radiation exposure and to guarantee that adequate safety measures are in place when using mobile fluoroscopic equipment.