x-ray film & composition

exit beam/remnant radiation

radiagtion that leaves patients’ body

latent image

invisible image

manifest image

visible image

x-ray film composition (4)

base, adhesive coating, emulsion, protective coat

base composition function

flexible, unbreakable, easy to handle, and provide rigidity so it can be coated with emulsion

base composition material

cellulose triacetate and polyester

adhesive coating

binds emulsion to base

emulsion layer

composed of silver halide crystals which are disposed evenly across the base

% of silver bromide in emulsion

95%

% of silver iodide in emulsion

5%

which two things make up silver nitrate

metallic silver and nitric acid

sensitivity speck

helps produce latent image

gurney-mott theory of latent image formation

sensitivity speck is added by making crystals respond to the action of x-ray and light

what charge does a sensitivity speck gain after a light photon interacts with the crystal?

negative charge

black metallic silver

gives density on film

how is black metallic silver produced

positively charged silver get attracted to the sensitivity speck

double emulsion/duplitized film

x-ray film that has a layer of emulsion on each side of the base

advantage of duplitized film

decreases PT exposure because of a faster speed

disadvantage of duplitized film

parallax effect: slight blurring and lost of detail at edges of an object due to a light photon entering the film emulsion at an angle

protective coat

protects the emulsion from damage