What strucure will appear most radiolucent on a radiograph?
air space
Many areas of black and white = __________ scale contrast, and ________ contrast
short
high
Many areas of gray = _______ scale contrast, and ________ contrast
long
low
The stepwedge can be used to demonstrate __________. It can also be used to monitor the ________ of film and film processing
contrast
quality
the _______ _______ of the ________ serves as a focal spot and converts electrons into x-ray photons
tungsten target
anode
The _______ the focal spot the sharper the image. Also, the emulsion of faster films contain __________ crystals that produce ________ image sharpness
smaller
larger
less
a decrease in object-film distance = a ______ in magnification
decrease
What portion of the silver halide crystals is chemically removed during the reduction process of film processing?
halide portion of the exposed energized silver halide crystals
What results in precipitated black metalic silver?
reduction of the exposed silver halide crystals
true or false. selective reduction refers to the reduction of the energized exposed silver halide crystals into black metallic silver, while the unenergized unexposed silver halide crystals are removed from the film
true
White areas on the film result from the removal of ___________ by the __________ solution
unexposed silver halide crystals
fixer
When does the film emulsion harden?
during fixation by the fixer solution
Both powder and liquid concentrate forms of film processing solutions must be mixed with ____________
distilled water
How often should the film processing solutions be replenished? Changed?
daily
every 3-4 weeks
What is the optimum temperature for developing?
68*
What is the purpose of the restrainer?
to control the developer, and prevent it from developing the exposed and unexposed crystals
true or false. The restrainer in the developer solution stops the development of both unexposed and exposed crystals, it is most effective in stopping the development of the unexposed crystals
true
What is about the average amount of films that are processed in a day?
30
What is the purpose of the hardening agent in the fixer solution?
harden and shrink the gelatin in film emulsion
Films that are unwrapped too close to the safe light for more than ____ -_____ minutes appear fogged. Also, a safelight must be placed a minimum of ______ feet away from the film and working area
2-3
4
weakened or exhausted developer solution produces what?
weakened or exhausted fixer solution produces what?
film with reduced density and contrast
films can turn a yellow or brown color
How often should the automatic film processor be cleaned
daily to weekly
an extraoral sized cleaning film removes any ________________ or ______ from the rollers of the automatic processor
residual gelatin
dirt
Developer spots are ______ spots on the film. Fixer spots are _________ spots on the film
dark
white
What is the appearance of static electricity on the film?
black, thin, branching lines
What will help you view the films better once they are mounted?
removing extraneous light
When and where should films be mounted?
infront of the patient, immediately after processing, and in an area equiped for mounting
curve of spee curves________towards the distal
up
If you have higher temperature you should ________ developer time
