Final answer:
The radiographer must wear a gown, mask, and gloves and clean the mobile unit before entering an isolation room with a mobile x-ray.
Step-by-step explanation:
The radiographer must wear a gown, mask, and gloves before entering an isolation room with a mobile x-ray machine. Wearing a gown and mask helps protect the radiographer from any potential contamination in the room, while gloves are necessary to prevent direct contact with the patient and equipment.
In addition to wearing protective clothing, it is important for the radiographer to clean the mobile unit before entering the isolation room. This ensures that the equipment is free of any dirt or contaminants that could pose a risk to the patient.