Also called a light guide. Amorphous polymer which has been purified and made dust-free during its manufacture. The light emitted from a body which is exposed to ionizing radiation. The sharpness of an image usually measured in line pairs per mm. The refractive index of the core is always higher than that of the cladding.
Light travels along the fiber in a straight line.
Thin plastic sheet in the range 25 - 500 microns thick which produces scintillation light. A dye which absorbs light at one wavelength and emits at a longer wavelength.