Which protective measure should be taken to safeguard patients during dental radiography?

Positioning the patient as far from the source of radiation as possible is a fundamental protective measure during dental radiography. This approach minimizes the patient's exposure to scatter radiation, which can occur when x-rays interact with materials in the environment and change direction. The further the patient is from the x-ray source, the lower the intensity of radiation they will receive, which directly correlates with reduced risk of radiation-induced effects.

In addition, proper patient positioning helps ensure that the beam is accurately directed to capture the necessary diagnostic images while reducing unnecessary radiation exposure to surrounding tissues. This principle aligns with the ALARA (As Low As Reasonably Achievable) concept, which guides radiation safety practices to keep doses as low as possible while achieving the required diagnostic information.

The other options do not align with radiation safety principles as effectively. For example, limiting the number of x-rays taken regardless of need could hinder proper diagnosis or treatment and is not a responsible practice. Encouraging patients to hold the film in place can increase their exposure to radiation and poses a safety risk; instead, proper equipment and methods should be used to secure the film. Finally, placing the x-ray unit closer to the patient would increase the radiation dose to the patient, which contradicts the goal of reducing exposure