Calcium tungstate screens are paired with which type of films?

Calcium tungstate screens are designed to emit blue light when exposed to x-rays. This characteristic makes them compatible with blue light sensitive films. When the x-rays pass through the tissue and interact with the calcium tungstate screens, the emitted blue light exposes the film. Blue light sensitive films have an emulsion that is specifically formulated to capture this wavelength effectively, thus ensuring optimal film exposure and image quality.

In contrast, red light sensitive films are designed to respond to longer wavelengths of light and would not be adequately exposed by the blue light from calcium tungstate screens. Green light sensitive films would similarly be mismatched, as they respond to green wavelengths rather than blue. Therefore, blue light sensitive films are the correct pairing with calcium tungstate screens in radiographic imaging.