Dark room equipments and entrance
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A presentation about Dark room entrance and equipments.
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Dark room equipments and entrance
- 2. By A.SHAJITHA B.sc RD Madras Medical College
- 3. A Dark room is a room, from which normal light is excluded. It is made completely dark to allow the processing of light sensitive photographic materials.
- 4. A Entrance to the dark room is light tight . The Door should have lock in the knob that will keep people from entering the room while film is being processed.
- 5. FOUR TYPES OF ENTRANCE REVOLVING SINGLE DOUBLE MAZE
- 7. Most efficient but most expensive type. Composed of two black cylinders. The outer is fixed. Inner is the revolving door with only one opening.
- 9. Simplest and cheapest type. Weather striping around the door frame. This type can cause accidental exposure of film to white light.
- 10. Used in single door system. To prevent accidental exposure of film to white light. It locks the door while the film bin is open or while film being processed.
- 12. Has two doors One leading in and other out with a short hallway in between. One door cannot be opened unless the other is closed. This type can cause trapping.
- 14. Has no doors. People can enter and exit at any moment. Takes up too much building space.
- 15. Processing Cassettes Safelight Hangers Automatic processor Tanks
- 16. We use FOUR tanks in the processing procedure. DEVELOPER RINZING FIXER WASHING
- 17. Universally 1 gallon 2 gallon 3 gallon 5 gallon 10 gallon used tank sizes:
- 18. Processing tanks are made up of stainless steel to avoid erosion. The width of the tank may vary according to the capacity of the tank.
- 19. A radiographic film cassette is a rectangle or square plastic or metallic container used to hold x ray film (exposed or unexposed) and intensifying screens in close and uniform contact with one another.
- 20. DIFFERENT CASSETTE SIZES 17 x 14 inches 15 x 12 14 x 14 12 x 12 12 x 10 10 x 8 12 x 6 (OPG)
- 21. 1. 2. 3. 4. 5. Hold intensifying screen and protect them from damage. Exclude all light from entering the cassette and fogging the film. Maintain a close and uniform contact between the screen and film. Exclude dust and dirt from the sensitive films. Act as a medium from exposure up to further processing of film.
- 22. A Safe light is a lamp which produces light in areas of the spectrum which will not affect photographic materials like film and photographic paper.
- 23. –BLUE LIGHT SENSITIVE FILM(400-450nm) RED—GREEN LIGHT SENSITIVE FILM ORTHOCHROMATIC(500550nm) TOTAL DARKNESS FOR PANCHROMATIC FILM (1200nm) AMBER
- 24. 15 W DRY BENCH
- 25. There are two safe lights in the dark room. One is on the wet bench Other one is on the dry bench
- 26. Safelights can be direct or indirect Should give sufficient light to facilitate work once your eyes have adjusted Must be at least 1.2m above work area Safelights are not completely safe over prolonged exposure so make sure you work quickly & efficiently to avoid fogging your film!!!!
- 27. Uses of safelight For loading and unloading of cassettes For processing procedure
- 28. A film hanger is a instrument or device for holding radiographic film during processing procedure. Available in various sizes. Made up of stainless steel.
- 29. Three types of hangers CLIP TYPE CHANNEL TYPE SPRING TYPE
- 30. Automatic film processor is a equipment. It used for the fast and efficient method in the film. In is mechanically transferred from the developer to the fixer. And is washed and finally dried.
- 32. Automatic processor contains DEVELOPER FIXER WASHING DRYER It contains rollers instead of rinsing in manual processing.
- 33. Advantages of automatic processor Dry to dry system No work load like manual processing It maintains the time and temperature of the processing procedure.
- 34. Automatic processor timings Developer -26 sec Fixer – 15 sec Washing – 15 sec Drier - 24 sec Travelling – 10 sec Total – 90 sec
- 35. Hatches are designed to transfer film cassettes to and from the dark room without radiation light entering It consist of metallic structures with a lead lining to provide x ray shielding. They are typically wall mounted and include automatic interlocks that close one door when other is opened.
- 36. It is also used for the temporary storage of loaded cassettes.
- 37. Film racks are used to keep the film boxes. It is very important that film boxes are always kept vertically. Not horizontally. When we keep horizontally pressure on the film boxes may produce artifacts.