Tracking unique radiation signature?
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In movies like The Dark Knight, Mission Impossible 4, and Star Trek: Beyond, we see characters attempting to track another person by a unique radiation signature emitted from their body. In the case of the first two examples, the radiation comes from an object that contaminates whoever touches it, so that even when the person doesn't have the object anymore, they can still be tracked.
- Does this technique have any basis in real life?
- What would be the problems if one would attempt this?
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