Final answer:
The variation in x-ray intensity should not exceed b)10%. A variation of 10% or less ensures that the x-ray machine is functioning properly and producing reliable results.
Step-by-step explanation:
The variation in x-ray intensity should not exceed 10% (option b).
When it comes to x-ray intensity, it is important to maintain a consistent level of intensity to ensure accurate imaging and minimize potential harm to the patient. A variation of 10% or less ensures that the x-ray machine is functioning properly and producing reliable results.
For example, if the x-ray intensity is supposed to be 100 units, a variation of 10% would mean that the intensity can range from 90 units to 110 units.