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U.S. Department of Health and Human Services

Radiation-Emitting Products

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Reloading Cassettes During an Inspection 

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Some inspectors have been under the impression that it is necessary to reload the first cassette (which is used for the first phantom image exposure) and let it sit for 15 minutes to assure that there are no air bubbles before exposing it for the reproducibility test (tests performed during testing on the 3.5.2 Exposure/Beam Quality [HVL] screen ). While it is important that cassettes bleed out air for 15 minutes before making phantom image exposures, the reproducibility test does not produce a usable phantom image and it does not matter if there is an air bubble in the cassette.

NOTE: Remember you DO NEED film in the cassette to maintain uniform and clinically relevant exposure conditions, but the reproducibility test (the second exposure with cassette #1) may be started as soon as the cassette is reloaded with film.