No.: Simple answer / complicated question. Depends on type of radioactivity in tile and what it was resting on. Very unlikely to casually run across radioactive source that could induce radioactivity in something else. Most household radioactivity is quite benign (does not have ability to penetrate air, skin, much less cell phone.) But, Americium 241 (smoke detectors) can be serious hazard. Do not eat!
Answered 8/18/2014
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