For fluoroscopy, the primary protective barrier must be made at least _ of lead equivalent for equipment capable of operating above 125 kVp:

The correct answer indicates that the primary protective barrier for fluoroscopy equipment operating at or above 125 kVp must be constructed with a minimum of 2.0 mm of lead equivalent. This requirement is based on established radiation safety standards that aim to effectively shield against the increased penetration of x-ray beams generated at higher kilovolt potentials.

Fluoroscopy procedures often involve continuous x-ray exposure, and as energizing the equipment to higher kVp increases the potential for radiation exposure, the construction of barriers must also meet specific protective standards. The 2.0 mm lead equivalent helps ensure that radiation is adequately attenuated to protect both the patient and healthcare personnel from excessive exposure.

The other measurements mentioned in the options do not meet the regulatory standards for equipment operating above 125 kVp, which is why they are not considered correct. Adequate shielding is essential in a clinical environment to maintain safe practices and reduce potential health risks associated with radiation exposure.