Functions
- Sensitivity of an X-Ray film to direct X-Ray photons is very low. The efficiency of X-Ray film to absorb X-Ray photons is only 1%. 99% of X-Ray photons are wasted.
- Intensifying screen has a greater efficiency to absorb X-Ray photons and convert them into ultraviolet light or visible light.
- Screen reduces exposure time and X-Ray dose.
- Screen reduces kinetic unsharpness.
- Cassette provides lightproof enclosure for an X-Ray film, which is sandwiched between a pair of screen.
Cassette provides contact between film and screen required for a sharp image by expelling out air trapped between film and screen.
Absorption, Conversion & Emission
|
Functions