Final answer:
The statement that is not true is that a lead apron should be carried with the unit and worn by the radiographer during exposure.
Step-by-step explanation:
All of the following statements regarding mobile radiographic equipment are true except:
A. the exposure cord must permit the operator to stand at least 6 ft from the patient, x-ray tube, and useful beam
B. exposure switches must be two-stage type
C. a lead apron should be carried with the unit and worn by the radiographer during exposure
D. the radiographer must alert individuals in the area before making the exposure
Based on the provided information, the statement that is not true is C. While a lead apron is important for radiation protection, it is not typically carried with the mobile radiographic equipment. The lead apron is usually present and available in the radiology department or imaging facility, and the radiographer would wear it during exposure to protect themselves from radiation.