Concept:X-rays have applications in medicine and industry, but they are not used for fingerprint detection.Explanation:Option A is correct: X-rays are used in hospitals to obtain images of bones and tissues.Option B is correct: X-rays are used in radiotherapy to treat cancer cells.Option D is correct: X-rays are used to detect hidden flaws in metal castings and welded joints.Option C is incorrect: Detecting fingerprints is not a standard use of X-rays.Answer:C. In detecting fingerprints