Final answer:
E-speed film requires less radiation than previous types to produce images, while F-speed film needs even less, reducing patient radiation exposure by about 20% to 50%. F-speed film's higher sensitivity ensures that diagnostic imaging is safer for patients, making it preferable in minimizing radiation risks.
Step-by-step explanation:
To compare the radiation exposure to the patient using E-speed film with that using F-speed film, we must understand that both E-speed and F-speed films are responsive to ionizing radiation, which alters the chemical composition of the film emulsion, resulting in an image. E-speed film, which is more sensitive than previous film speeds (like D-speed), requires less radiation to produce an image. However, F-speed film is even faster and more sensitive than E-speed film, meaning it requires even less radiation exposure to produce the same degree of film darkening or image quality. This reduction in exposure is beneficial for patient safety, as it minimizes the radiation dose a patient receives during imaging procedures.
In practical terms, F-speed film can reduce the patient's radiation exposure by approximately 20% to 50% compared to E-speed film, depending on specific equipment and settings. This is significant in the field of dental radiography, for example, where frequent X-rays can lead to cumulative radiation doses. It is critical to limit this exposure with the use of fast films, lead aprons, and proper technician protocols to reduce the risks associated with diagnostic imaging.