<unk> s (denoted as γ) are a form of electromagnetic radiation or light emission of frequencies produced by sub-atomic particle interactions, such as electron-positron annihilation or radioactive decay.<unk> s are generally characterized as electromagnetic radiation having the highest frequency and energy, and also the shortest wavelength (below about 10 picometer), within the electromagnetic spectrum.<unk> s consist of high energy photons with energies above about 100 keV.<unk> s were discovered by Paul Villard, a French chemist and physicist, in 1900, while studying uranium.
Hard X-rays overlap the range of "long"-wavelength (lower energy)<unk> s. The distinction between the two terms, however, depends on the source of the radiation, not its wavelength; X-ray photons are generated by energetic electron processes,<unk> s by transitions within atomic nuclei.
Due to their high energy content,<unk> s can cause serious damage when absorbed by living cells.
Gamma ray
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