How often does the SCREEN/FILM/CASSETTE SPEED MATCHING need to be evaluated?

• A. Daily
• B. Annually
• C. Monthly
• D. Weekly

Answer: (B)

Speed matching examines how the screen and film (cassette) work together so that a given exposure produces the expected film density. Over time, aging of screens, films, and cassettes can change how quickly light interacts with the emulsion, causing the density for a standard exposure to drift. Because these changes occur slowly, the evaluation is done on a yearly basis to ensure the system remains in spec without needing constant checks. If a test shows a discrepancy, it signals that a component may have aged or been affected by service, and adjustments or replacements are needed with another recheck. Daily or weekly checks are typically reserved for other, more rapidly changing QA items, while monthly checks aren’t the standard cadence for this particular parameter.