Most commonly used colour of the filter used in dark room safelight is:
Correct Answer: Red
Description: X-ray films are very sensitive to the blue-green region of the spectrum and are less sensitive to red wavelengths. The red GBX-2 filter is recommended as a safelight in darkrooms where either intraoral or extraoral films are handled because this filter transmits light only at the red end of the spectrum.
Film handling under a safelight should be limited to about 5 minutes because film emulsion shows some sensitivity to light from a safelight with prolonged exposure. The older ML-2 filters (yellow light) are not appropriate for fast intraoral dental film or extraoral panoramic or cephalometric film.
Reference: White and Pharoah's Oral Radiology Principles and Interpretation 7th edition page no 71
Category:
Radiology
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