Final answer:
A secondary factor in controlling exposure to an image receptor includes the length of exposure time, intensity of treatment, and specific conditions that may affect exposure effectiveness. In radiation safety, methods such as shielding, distancing, and time reduction are used.
Step-by-step explanation:
A secondary factor in controlling the exposure to an image receptor can include the length of exposure time, the intensity of the treatment, and the presence of materials or conditions that may reduce the effectiveness of the exposure protocol. In the context of radiation, controlling exposure is crucial for protecting both the patient and healthcare professionals from unnecessary radiation. Shielding, such as lead aprons, increases in distance from the source, and limiting exposure time are practical methods to reduce radiation doses in medical settings. Secondary pollutants or contaminants are different as they refer to substances that form in the environment when primary pollutants react after being released.