In screen/film contact testing, what type of copper/wire mesh tool and surface should be used?

• A. Fine mesh across the film surface
• B. Coarse mesh across the entire film/screen surface
• C. Medium mesh across the screen surface
• D. Coarse mesh across half the surface

Answer: (B)

Assessing film-screen contact relies on a wire or copper mesh placed between the film and the screen to create a visible pattern on the radiograph. Using a coarse mesh across the entire film/screen surface is best because the larger grid squares produce a clear, easy-to-interpret pattern that will reveal any gaps or uneven contact as blurred or distorted lines. Covering the whole surface ensures you detect poor contact anywhere on the plate; a fine mesh or partial coverage would either hide or miss contact issues, making the test less reliable.