d. Record the different values on the film.
The density differences between the fogged and unfogged areas on the
radiographic film should not exceed .05 for a two-minute exposure.
7-16. PREVENTIVE MAINTENANCE
a. This is a constant project that should be performed at six-month intervals.
b. This test should be performed when fog becomes a problem in the darkroom
7-17. CORRECTIVE MAINTENANCE
a. Replace the defective safelight as soon as possible.
b. Replace the light bulb with proper wattage light bulb. The darkroom
technologist can do this.
Section IV. DARKROOM ASSURANCE LIGHT LEAK TEST
This test is performed to check the darkroom area for light leaks because they
could fog the radiographic films.
a. Turn off all the safelights and white lights.
b. Accustom your eyes to the dark (about 15 minutes).
c. Look for evidence of light penetrating the darkroom.
Check the seals on the door entrance.
Check the seals on the processor.
Check the light on the silver recovery system.
Check the seal on the passboxes.