What is the typical thickness range of film base?

The typical thickness range of film base is accurately represented by the value given in the correct choice, which is 150-330 µm. This thickness range is significant because it reflects the standard dimensions for film base used in radiographic imaging.

A thickness of 150-330 µm allows for the balance of durability and flexibility in the film base, ensuring that the film is both easy to handle and capable of withstanding the development processes it undergoes. The film base must be thick enough to carry the emulsion layer, which is where the imaging happens, while remaining thin enough to allow for the quality and resolution necessary in radiographic images.

The other choices deviate from this standard. A thickness of 150-300 µm underrepresents the upper end typically expected. A value of 200 µm may seem plausible but lacks the wider range that is typical for film bases. Lastly, a thickness of 300-400 µm exceeds the common specifications for film base used in medical imaging, as it would make handling and processing more cumbersome without providing additional benefits for image capture quality. Therefore, the chosen thickness range of 150-330 µm is the most accurate representation of typical film base thickness.