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Gamma ray

Gamma ray

(Science: radiobiology) electromagnetic radiation (photons) with energies greater than (roughly) 100 kev (that is, 100,000 electron volts). Gamma radiation frequently accompanies alpha and beta decays, and always accompanies fission. Gamma rays are highly penetrating and are best shielded against using dense materials, such as lead or depleted uranium. (gamma rays are similar to x-rays, but are generally higher in energy and nuclear in origin.)

gamma rays have wavelengths of 1 nanometre or shorter. These are highly energised, deeply penetrating photons which can be emitted from an atomic nucleus during nuclear fission (the splitting of an atom) and during regular atomic decay (radioactivity).

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