Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
241Ch1920
chapter 1920
| Question | Answer |
|---|---|
| Pass box | used to pass film cassettes |
| entrance to darkroom | may be double interlocking room, light proof maze, and revolving door |
| volume replenishment system is used | in a very busy radiology department |
| If fixer is not cleared from film, | it may result in yellowing of emulsion after years |
| washing process | is used to remove both developer and fixer |
| fixer soln | will eventually be saturated with silver ions |
| developer has ____ph, while fixer has ____ph | developer- alkaline ph fixer- acidic ph |
| most commonly used clearing agent found in fixer soln is | ammonium thiosulfate. |
| clearing agent will bond with | unexposed silver halides |
| processor lid is propped open when processor is not in use to | prevent evaporation, fixer condensation, and contamination |
| most common cause of developer contamination is | splashing |
| film processed in contamination developer will | exhibit low contrast |
| developer of automatic processor is | the soln most affected by contamination |
| solvent used in both developing and fixer is | water |
| most common developer soln hardener is | gluteraldahyde |
| as the developer is in its final stages of oxidation | its color will change to a rusty red |
| when phenidone and hydroquinone are combined and work together forming a _____ ______, their reducing ability is greater than the sum of their independent abilities, which is a phenomenon known as _________ | PQ developer, superadditivity |
| Hydroquinone is | reducing agent that slowly reduces silver, producing heavey densities |
| Phenidone is | reducing agent that works only in areas with light exposure |
| Phenidone is reducing agent that | quickly reduces silver, enhancing fine detail |
| reducing agents used in automatic radiographic processors are | phenidone, hydroquinone, and together known as PQ developer |
| If silver halide crystal has more than __ silver atoms on their sensitivity speck | 3, crystals will be able to developed |
| chemical fog is | the effect on a film when unexposed silver halides are Reduced by a soln with a high concentration, can also be caued by high temsp and too long in the soln |
| reducing agents | neutralize positive silver ions, by giving up electrons |
| stable black metallic silver atom is formed when | a positive silver ion obtains an electron |
| silver halides have | negative exteriors and positive interiors |
| the primary chemical agents in fixer are called | clearing agents, (they clear unexposed silver halides from film) |
| primary chemical agents in the devloper are called | reducing agents |
| an image first becomes visible on film | during the development process |
| primary steps of automatic processing | developing, fixing, washing, and drying |
| most variable and sensitive factor in production of radiographi | is the radiographic film processor |
| primary puspose of radiographic processing is | to convert the latent image into a visible image |
| radiographic film should be | stored at temperature below 68 degrees F, 30-60% humidity, and on end |
| small crystal size will produce | high resolution and a slow speed |
| which type of film has fastest speed | screen film mammo film dental extremity detail film |
| single incident photon can | free thousands of electron for deposition at a sensitivity speck |
| Gurney-Mott theory, | an incident photon interacts with one of the halides and eject an electron |
| definition of latent image | unseen change in the atomic structure of the crystal lattice |
| due to intensifying screens, | light photons have the primary interaction with the radiographic film, (not x-rays) |
| panchromatic film | is sensitive to all colors |
| sensitivity speck definition | impurity added to the crystal lattice is called |
| gold-silver sulfide. | impurity added to the crystal lattice is. |
| crystal lattice is | bound together by strong ionic bond |
| each crystal is a | cubic lattice (matrix) of silver, bromide, and iodine atoms (not potassium) |
| potassium nitrate | waste product formed during crystal production |
| radiographic film NOT a single-emulsion film | fluoroscopy (double) mammo (single( dental (single, no screen) duplication (single emulsion) |
| photosensitive agents used in diagnostic film are | silver halide crystals made of Silver bromide, silver, iodide, and silver chloride (silver bromide is most common) |
| emulsion is composed of gelatin that | has photosensitive silver hadlide crystals and silver salt suspended throughout |
| adhesive is | applied to the base to glue the emulsion to the base |
| modern film base is | polyester and good quality film should be Flexible, stable, rigid, and be uniformly lucent |
Created by:
rose99