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Gamma radiation, also known as gamma rays (denoted as γ), is electromagnetic radiation of high frequency (very short wavelength). They are produced by sub-atomic particle interactions such as electron-positron annihilation, neutral pion decay, fusion, fission or inverse Compton scattering in astrophysical processes. Because tungsten gamma radiation are a form of ionizing radiation, they pose a health hazard. A classical gamma ray source is a type of radioactive decay called gamma decay where an excited nucleus emits a gamma radiation almost immediately on formation. However, gamma decay may also describe isomeric transition which involves an inhibited gamma decay with a relatively much longer half life. Tungsten gamma radiation shielding is a suitable shielding for radiation protection.