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VetSkill Level 3 Diploma VN02 – Diagnostic Principles Practice Test

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The fixing chemical commonly used in radiography is
Correct Answer:
Sodium thiosulphate
Explanation:
In radiography, fixing removes unexposed silver halide from the film emulsion to lock in the image. The chemical that does this best is sodium thiosulfate, which dissolves the unexposed silver halide as a soluble thiosulfate complex, leaving the developed image intact and stable when washed and dried. Sodium sulfite is typically included in fixers as a preservative to prevent thiosulfate oxidation and reduce fog, but it is not the primary fixing agent. Sodium bicarbonate is mainly a buffering or pH-adjusting agent in other solutions, not a fixer, and hydrochloric acid would damage the emulsion rather than fix it.

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