test 2 Flashcards
the dental x ray films serves as a recording medium or
image receptor
image receptor refers to
a picture or likeness of an object
the term receptor refers to something that responds to
stimulus
film base is a
thin flexible (blue tinted to enhance contrast and image quality) covered with photographic emulsion on both sides
adhesive holds
emulsion to film on both sides
emulsion is
is a gelatin with suspended silver halides salt crystals. When placed in water the gelatin swells exposing the silver salts to the developing sol’n. As the gel dries and shrinks, the smooth surface left becomes the radiograph.
During radiation exposure, the x-rays strike and ionize some, but not all, of the
silver halide crystals, resulting in the formation of a latent image (invisible image).
Radiation striking the film causes
ionization of the silver halide
true or false
The amount of radiation is dependent upon what it passes through first.
true
The silver halide salts in the gelatin is very sensitive to
xrays
. The more radiation these crystals absorb
the darker the image will be.
Processing fluids react with these crystals to
produce a visible image on the film
On dental film
90-99% of the salts are silver halide
-1-10% is silver iodide
A Protective Layer, or supercoating of gelatin protects
the emulsion layers
composition of DentalX-ray Film
Film base
Adhesive
Emulsion
Protective layer
What is a thin flexible (blue tinted to enhance contract and image quality covered with photogaphic emulsion on both sides
Film base
What holds emulsion to film on both sides
adhesive
Emulsion is
a gelatin with suspended silver halides salt crystals. When placed in water the gelatin swells exposing the silver salts to the developing sol’n. As the gel dries and shrinks, the smooth surface left becomes the radiograph
During radiation exposure, the x-rays
strike and ionize some, but not all, of the silver halide crystals, resulting in the formation of a latent image (invisible image).
Radiation striking the film causes
ionization of the silver halide. The amount of radiation is dependent upon what it passes through first.
The silver halide salts in the gelatin is
very sensitive to x-rays. The more radiation these crystals absorb the darker the image will be.
Processing fluids react with these crystals to
produce a visible image on the film
Silver halide crystals
On dental film
-90-99% of the salts are silver halide
-1-10% is silver iodide
A Protective Layer, or supercoating of gelatin protects the emulsion layers
Outer Film Packet
Mechanical barrier which is a plastic envelope-like package which protects the film from light, scratches, etc.
Identification dot is visible on the back of the packet- the flap side with color. This raised dot on the film denotes front and back or which side is up.
This dot is ALWAYS placed in the holder 1st
White side toward PID