RT103 Flashcards
is designed for handling and storage of x-ray film
darkroom
are passed into the darkroom as a passbox
film cassettes
pass boxes have 2 sides
exposed and unexposed
a typical size for darkroom is
2.0 x 3.0 meters
Two doors placed one behind the other, with enough space between them to allow the person to enter and close the outer door before opening the inner one
The lock entrance
more space consuming the side walls are black, serves as completely clear sign post
The labyrinth or maze
emit an orange yellow light but their intensity is too high for direct illumination
sodium vapor safelights
they emit light in the 660 nm range, use very low power and last 10-15 yrs
LED
safeness of light depends on
distance
wattage of bulbs
spectral sensitivity
length of time
filter interact
instrument used to measure blackening on radiographs
densitometer
darkroom is installed in two distinct parts namely
dry side and wet side
Wet side have at least 4 tanks:
developing tank
tank for rinsing
fixing bath
tank for washing
what is the humidity range
40-60%
what is the temperature range
20°C to 21°C
instrument uses the difference in readings between two thermometer to measure the moisture content or relative humidity of air
Psychrometer
A device used to measure environmental moisture
Hygrometer
supply air in dakroom and humidity level ventilation condition should be between
15°C and 21°C and a humidity level between 40% and 60%
is a device used to measure viewbox illumination intensity
photometer
Photometers measures:
illuminance
irradiance
light absorption
scattering of light
fluoresensce
phosphorescence
luminiscence
used for capturing displaying and storing radiographic images
medical x-ray film
coating is done generally in 3 layers
substratum layer
emulsion layer
top coat layer
the foundation or support that allows the film to maintain shape
Base
is a blue tinted
modern x-ray film
the film base was originally composed of
glass plate
the glass plate was replaced using
cellulose nitrate
modern radiographic film base is made of ______ introduced in 1960’s bu DuPont
polyester
is a layer of hard protective gelation it makes nearly imposible to tear a radiograph
supercoat
is applied to the base material before it is coated with the emulsion, it prevents bubbles
adhesive
two most importang ingredient of a photographic emulsion are
gelatin and silver halide
is chemically a colloid
gelatin
photographic gelatin for x ray film is made from _____ mostly ______
from bone, cattle bone
is the light sensitive material in the emulsion
silver halide
is the invisible change induced in the various silver halide crystals
The latent image
is the ability to accurately image an object, it is called detailed sharpness definition and resolving power
resolution
refers to the color of light to which a particular film is most sensitive
spectral sensitivity
film is also available with different sensitivity to light photons or speed
film speed
is the degree to which the emulsion is sensitive to xrays or light
film speed
states that the exposure of radiographic film depends on the intensity of xrays of the remnant beam
reciprocity law
is designed to provide an exact image of the original film
duplication film
is a fine grain clear (non-tinted) base film designed to reverse the image of a pleminary scout angiogram film
substraction film
is a measurement of the characteristic responses of film to exposure and processing
sensitometry
instrument that provides a readout of amount of blackening of a film
densitometer
the layer of the intensifying screen closest to the xray film is the protective coating
protective coat
the active layer of intensifying sreen
phosphor layer
is the ability of a material to emit light in response to excitation
luminiscence
