Final answer:
F-speed film emulsion is twice as fast as D-speed film, meaning it requires less radiation to produce an image due to the larger silver halide crystals in its emulsion.
Step-by-step explanation:
In comparing D and F-speed intraoral radiographic films, the F-speed film emulsion is approximately twice as fast as D speed film. Speed in radiographic films indicates the amount of radiation required to produce an image; the faster the film, the less radiation is needed.
F-speed film, also known as Insight film, has larger silver halide crystals in its emulsion, which makes it more sensitive to X-rays and decreases the exposure time needed compared to D-speed film. This not only improves patient safety by reducing radiation exposure but also enhances workflow efficiency in dental practices. Therefore, the correct answer to the question is 1) Twice as fast as D speed film.