Dental RaDiogRaphy exam 1 alReaDy passeD
Film Speed ✔✔ Represents the amount of radiation required to produce a radiograph of
acceptable density A-F speed
Man, that discovered the x-ray in November 8, 1895 ✔✔ Wilhelm Conrad Roentgen
Film Storage ✔✔ Store at 50-70 degrees F (storage at higher temperature may result in FILM
FOGGING)
Opened boxes of screen film need to be kept in a light tight area
Do not store in a room where x-rays are taken
Film Speed + Screen Speed= System Speed
Intensifying Screens ✔✔ Converts x-ray energy into light energy (fluorescence) then exposes
film
Intensify Screen Composition ✔✔ Base - plastic for support
Reflecting layer - reflects light back towards film
Phosphor Layer - calcium tungstate or rare earth
Protecting coat - plastic
Extraoral Film T-MAT ✔✔ Flat tabular silver halide grains
Calcium Tungstate ✔✔ blue-light emitting
, Rare earth ✔✔ green-light emitting
Image Formation & Processing ✔✔ x-ray photon deposits energy in crystal , deposition of xray
energy within the crystal creates a LATENT IMAGE SPECK
Following exposure, the emulsion contains both exposed and unexposed crystals
Steps of Processing ✔✔ Develop
Rinse (manual only)
Fix
Wash
Dry
Following exposure the emulsion contains exposed and unexposed halide crystals. It is
necessary to chemically process the film in order to make the latent image visible
Developing Solution ✔✔ Activator
Restrainer
Developer
Preservative
Hardener
During development, the developing agents precipitate ALL of the silver in crystals containing a
latent image. The activator swells & softens the emulsion. The Restrainer prevents development
of unexposed crystals.
Once the film is developed, it is transferred into the fixing solution.
Film Speed ✔✔ Represents the amount of radiation required to produce a radiograph of
acceptable density A-F speed
Man, that discovered the x-ray in November 8, 1895 ✔✔ Wilhelm Conrad Roentgen
Film Storage ✔✔ Store at 50-70 degrees F (storage at higher temperature may result in FILM
FOGGING)
Opened boxes of screen film need to be kept in a light tight area
Do not store in a room where x-rays are taken
Film Speed + Screen Speed= System Speed
Intensifying Screens ✔✔ Converts x-ray energy into light energy (fluorescence) then exposes
film
Intensify Screen Composition ✔✔ Base - plastic for support
Reflecting layer - reflects light back towards film
Phosphor Layer - calcium tungstate or rare earth
Protecting coat - plastic
Extraoral Film T-MAT ✔✔ Flat tabular silver halide grains
Calcium Tungstate ✔✔ blue-light emitting
, Rare earth ✔✔ green-light emitting
Image Formation & Processing ✔✔ x-ray photon deposits energy in crystal , deposition of xray
energy within the crystal creates a LATENT IMAGE SPECK
Following exposure, the emulsion contains both exposed and unexposed crystals
Steps of Processing ✔✔ Develop
Rinse (manual only)
Fix
Wash
Dry
Following exposure the emulsion contains exposed and unexposed halide crystals. It is
necessary to chemically process the film in order to make the latent image visible
Developing Solution ✔✔ Activator
Restrainer
Developer
Preservative
Hardener
During development, the developing agents precipitate ALL of the silver in crystals containing a
latent image. The activator swells & softens the emulsion. The Restrainer prevents development
of unexposed crystals.
Once the film is developed, it is transferred into the fixing solution.
