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Mr. Dubey • 54.24K Points
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Q. Which of the following conditions might cause mottling of a radiographic film?

(A) Test piece with thickness equal to an integral multiple of the primary beam wavelength
(B) Back scatter from aged fluorescent screens
(C) Test piece with thickness of the same order of magnitude as the grain size
(D) Test piece with thickness equal to an integral multiple of the average grain size
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