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• Viewing box


  A simple but important aid to viewing radiographs, commonly used throughout X-ray departments, consisting of an even light source of sufficient light intensity to allow optimum viewing
• Viewing box

  • Conveniently placed
  • Safely fixed to a wall or stable mobile structure
  • In good working order
  • Of satisfactory design
  • Has an all over even light
  • Clean inside and out
  • Electrically safe
  • Has an adequate light output
• Viewing box design


  1. Two parallel fluorescent tubes of equal light output, with starters

  2. A built in, or attached, spotlight is an advantage

  3. The film anchor should hold the film firmly

  4. A good quality switch

  5. Safe electrical wiring
• Viewing box cleaning


  1. Remove plug from power socket

  2. Remove the front window

  3. Clean window on both sides (intensifying screen cleaner is a useful cleaning agent as it has anti-static properties)

  4. Clean the back plate and fluorescent tubes

  5. Inspect window for damage

  6. Make sure that tubes and starters are firmly in place

  7. Replace window

  8. Test
• Dust on the window or tube will reduce the light output
• Marks on the window can be misleading
• Frequency of viewing box cleaning

  • Outside daily
  • Inside 6 monthly
• Equipment required for viewing box cleaning

  • Viewing box to be cleaned
  • Clean cloth
  • Screw driver
• Electrical check should be carried out by or under the supervision of an electrician
• Items to be checked during electrical check

  • Switches
  • Fluorescent tubes
  • Starters
  • Electrical connections
• Frequency of electrical check

  • 6 monthly
• Equipment required for electrical check

  • Viewing box to be checked
  • Screw driver
• Electrical check procedure


  1. Remove plug from socket

  2. Remove front window

  3. Check condition of wiring

  4. Check electrical connections

  5. Check stability of switch

  6. Check installation of fluorescent tubes and starters

  7. Replace front window

  8. Replace plug in socket

  9. Test
• Replacing fluorescent tubes at different time intervals, or with a different type of tube, may produce a difference in light intensity from one side of the screen to the other or one viewing box to another
• If, after replacing only one tube, it is found to be brighter than the remaining one, replace both
• The working tube that has been removed can be matched with another one at a later date
• Room light levels in the film viewing area should not be too high
• A bright spotlight should be available for viewing dark areas of the film
• The viewing box should be mounted at the correct height for easy viewing
• Light source should be even and the same as other boxes
• Cassette Inspection Frequency

  Yearly
• Cassette Inspection


  Inspection for faulty parts, distortion, and inadequate cleanliness of cassette
• Light Leakage Test Frequency

  Yearly
• Light Leakage Test


  Test for black fogging on edge of film
• Cassette Inspection Equipment


  Casettes
• Light Leakage Test Equipment

  Cassettes
• Intensifying Screen Inspection Frequency

  Monthly
• Intensifying Screen Inspection Equipment

  Screens
• I.S. Inspection


  Inspect for abrasions, foregin material on screen, discoloration
• I.S. Cleaning Frequency

  Monthly
• I.S. Cleaning


  All dust particles removed, check if there are smears
• I.S. Cleaning Equipment


  Soft brush, puffer lint-free cloth, screen cleaner
• F.S. Contact Test Frequency

  Yearly
• F.S. Contact Test Equipmemt

  Cassette, test tool, lead marker
• F.S. Contact Test


  Localized blurring for suspected F.S. contact
• Electrical Check Frequency

  6-monthly
• Electrical Check


  Check switches, fluorescent tubes, starters, etc.
• Electrical Check Equipment


  Viewing box & screwdriver
• F.S. Compatibility-Color of Light Emission Test Frequency

  As necessary
• F.S. Compatibility-Color of Light Emission Test

  Change any type of film used so they are compatible