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
Film Processing
H B Film Processing
| Question | Answer |
|---|---|
| red safelight can be used with | blue and green |
| amber safelight can only be used with | blue |
| CA wants you to use what safelight | red |
| any combination of mA and time to get the same mAs | reciprocity law |
| Films sensitive to Green Light | orthochromatic |
| films are most sensitive to | green and blue light |
| Removes white areas of the film and allows it to have an archival quality to keep for years | fixing |
| PROCESSING STEPS | wetting, developing, fixing, wash and drying |
| changes the silver ions of the exposed crystals to metallic silver | developing |
| developing agent | reducing agent |
| causes the emulsion to swell so chemicals in the baths can reach all parts of the emulsion | wetting |
| The latent image is converted to the manifest image | developing |
| does not allow unexposed silver halide crystals to be reduced to metallic silver --- fog | restrainer |
| preservative – to prevent oxidation of the developer | sodium sulfite |
| Hardener present in the developing solution | glutaraldehyde |
| prevent unexposed silver halide crystals from being developed | Restrainers |
| Principle component of developer | hydroquinone |
| migrates through the gelatin and is released from the film | bromide |
| contains alkali agents | developer |
| what chemicals are in the buffer solution | sodium carbonate and sodium hydroxide |
| its purpose is to remove unexposed and undeveloped silver halide crystals from the emulsion | hypo or thiosulfate |
| The clearing agent is known as | hypo or thiosulfate |
| One of the most common clearing agents used is | ammonium thiosulfate |
| neutralizes the pH of the emulsion and stops the development process | activator |
| stops the development process | The fixer |
| Hyporetention is prevented by | adequate washing |
| Retention of the fixer on the film will cause the film to have a | yellow-brown appearance |
| Warm air is blown over both surfaces of the film | DRYING |
| TYPES OF FILM | screen and direct exposure |
| film used with radiographic screens | Screen film |
| non-screen film | Direct exposure film |
| X-ray film is sensitive to | white light and x-ray radiation |
| radiation and white light can cuase | fog |
| film must be kept in a | light tight container |
| X-ray film is sensitive to both | heat and humidity |
| heat and humidity can cause increase | fog |
| have a transport system consisting of multiple rollers in racks | Automatic processors |
| If there is dirt on the roller it will mark the film | every 3.14 inches |
| artifacts on the film due to dirt on the roller | Pi Lines |
| The rollers are driven by | chains, gears, or belts |
| rollers sizes are usually | 1” in diameter |
| temperature that under develops film | cold |
| temperature that over develops film | hot |
| Both need to be replenished during processing | Developer and Fixer |
| DIRECT EXPOSURE FILM | Thicker emulsion i |
| film mostly used only by dentristy | direct exposure |
| x-ray film is sensitive to various colors of light | Spectral matching |
| light from screen exposes the adjacent emulsion but can also cross the base and expose the opposite side emulsion, | crossover |
| Crossover leads to | image unsharpness (blur) |
| what affects speed of the film | size and shape of crystal |
| The faster the speed the less | radiation is needed |
| black and white with a few shades of gray | High contrast |
| contains a clearing and hardening agent | fixer |
Created by:
hakrrins
Popular Radiology sets