Radiographic TechniqueQuestion 54 of 100
Which darkroom test verifies that the safelight is not fogging film?
a.Exposing a stepwedge and comparing densities
b.Placing a thermometer in the developer for five minutes
c.The coin test, in which a coin is placed on an unwrapped film under the safelight before processing
d.Running a cleaning film through the automatic processor
Explanation
In the coin test an unwrapped film is left under the safelight with a coin on it for a few minutes; if the coin's outline is visible after processing, the safelight is fogging the film and the bulb, filter, or distance must be corrected. The stepwedge test monitors solution activity rather than safelight integrity. Checking developer temperature and running a cleaning film address processing quality, not light leakage.
Practice all 100 questions free — no signup required.
Related questions on this topic
- An image of an elderly patient shows the entire radiograph blurred, with no sharp outlines anywhere. What is the most likely cause?
- Using the bisecting technique, how does vertical angulation differ between maxillary and mandibular projections?
- What is the purpose of the raised identification dot on intraoral film, and how should it be oriented during placement?
- Which head position is correct when preparing a patient for a panoramic radiograph?
- A panoramic radiograph shows a dark radiolucent band across the apices of the maxillary teeth. What instruction was missed?
- An office uses photostimulable phosphor (PSP) plates. A faint image from the previous patient appears on a new radiograph. What was omitted?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against DANB Radiation Health & Safety (RHS) + Infection Control (ICE) Exams · How we review