How is film analyzed to determine radiation exposure?
Text Box: A film dosimeter is comprised of a film packet, filters and a holder. Film dosimetry is unique, in that each processor can use a specific type of film, varying number of filters with varying mg/cm2 thicknesses, and varying type of holder configurations. One of the most commonly used films is Kodak Type 2.  The film is assembled in a plastic holder which contains several specific areas of filtration for assessment of dose. An unirradiated film packet is clear, similar to film used in an x- ray facility in a medical office. When film is irradiated, there is a darkening of the film, and based on each of the filtered areas, there is a different response, in Optical Density) based on the type of radiation, be it gamma, low energy x-ray or beta, and, the level of exposure. These filtered images are visible after the film is developed