gamma ray

3 ENTRIES FOUND:

gamma ray

noun

Definition of GAMMA RAY

:  a photon emitted spontaneously by a radioactive substance; also :  a photon of higher energy than that of an X-ray —usually used in plural

First Known Use of GAMMA RAY

1903

Rhymes with GAMMA RAY

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gamma ray

noun    (Medical Dictionary)

Medical Definition of GAMMA RAY

: a photon emitted spontaneously by a radioactive substance; also : a high-energy photon—usually used in plural

gamma ray

noun    (Concise Encyclopedia)

Penetrating very short-wavelength electromagnetic radiation, similar to an X-ray but of higher energy, that is emitted spontaneously by some radioactive substances (see gamma decay; radioactivity). Gamma radiation also originates in the decay of certain subatomic particles and in particle-antiparticle annihilation (see also antimatter). Gamma rays can initiate nuclear fission, can be absorbed by ejection of an electron (see photoelectric effect), and can be scattered by free electrons (see Compton effect).

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