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Oct 16, 2020 at 19:39 comment added PM 2Ring What Jon said. The modern convention is to distinguish x-rays from gamma rays by their origin, not their energy. However, astronomy & astrophysics still tend to use the older convention based on energy (or wavelength), so EM of >100 keV is called gamma rays. That's partly because it can be difficult to discover the mechanism of an astronomical EM source.
Oct 16, 2020 at 18:06 comment added Jon Custer This is not completely true, but discipline specific. See physics.stackexchange.com/questions/509620/… for example.
Oct 16, 2020 at 18:04 history answered R.W. Bird CC BY-SA 4.0