T.O. 33B-1-11-74g. Expose equal sections of the radiographically exposed test film to the safelight by sliding the opaquematerial the length of the film in 6 minute, 3 minute, 1 minute, 30 seconds, 15 seconds, 0 second timeintervals, (leaving the last section unexposed to the safelight). This will result in six test film sections,each with a different safelight exposure consisting of the following: 10 minutes and 45 seconds, 4minutes and 45 seconds, 1 minute and 45 seconds, 45 seconds, 15 seconds and 0 seconds.h. Cover the entire test film with the opaque material, taking care not to lift the mask off of the test film,as this would result in the 0 second section being exposed to the safelight.i. Turn off the safelight being tested.j. Develop the film as you would normally, with the exception of it being performed in total darkness.k. Repeat the individual safelight test procedure for each safelight, if required. Great care must be takennot to unintentionally expose test film to safelight. Undeveloped test film SHALL be maintained in alight tight container prior to it being developed and not being used to perform a safelight test.l. Upon completing the initial individual safelight test for each safelight, perform the collective safelighttest. The initial and periodic collective safelight test is similar to the individual safelight test with theexception of the following:(1)All safelights SHALL be turned-on during the safelight time interval exposures.(2)The radiographically exposed test film SHALL, be positioned in the usual area where normalundeveloped radiographically exposed film is handled. This area SHALL NOT be less than fourfeet from any safelight source.m. After all test films have been developed in total darkness, read the densities of the five safelight exposedsections comparing them to the sixth section on their respective test film. The section with the leastamount of safelight exposure that has a measurable density increase is the maximum time that anundeveloped radiographic film SHALL be allowed to be exposed to safelight in the darkroom.n. If this time restriction is 4 minutes and 45 seconds or less, or not suitable for operational needs, one ormore of the following actions SHALL be taken:(1)Replace safelight filters that are faded, cracked, are not designated for industrial radiographicfilm, crazed, do not fit properly, or scratched.(2)Replace safelight bulbs that exceed the wattage recommended by the manufacturer.(3)Replace safelights that are unserviceable, such as emitting ambient light.(4)Eliminate or reconfigure uncontrollable ambient light sources such as doorways, ventilating andheating ducts/vents, faulty film pass through box, building structural cracks, and holes aroundpipes and electrical wiring.(5) In the event that the individual safelight tests are all within an acceptable tolerance, but thecollective safelight test is unacceptable, investigate, the validity of the individual safelight test andwhen, in fact, the results of these tests are correct, reduce the number of safelights in the darkroom.The level of safelight that SHALL be present is the minimum required to perform undeveloped filmpreparation/ development operations.
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