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There seems to be quite an overlap in the bands of electromagnetic radiation which are classed as X rays and as gamma rays. You hear of gamma rays with energy of 1Mev and X rays with enery of 3MeV.Is it just a matter of context and how they are produced? i.e. gamma rays come from nuclear decay and X rays are produced by fast electrons.There's no way of telling, when one goes past, what to call it.