Gamma knife



noun
1.
an machine that uses radiation with extreme accuracy to destroy abnormal tissue, esp in the brain
noun

a medical device using intersecting beams of gamma rays to treat brain tumors and lesions

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  • Gamma-ray

    noun, Physics. 1. a photon of penetrating electromagnetic radiation (gamma radiation) emitted from an atomic nucleus. 2. a photon emitted by an electron as a result of internal conversion. 3. electromagnetic radiation with wavelengths shorter than approximately one tenth of a nanometer. gamma ray n. Electromagnetic radiation emitted from the nucleus of an atom by […]

  • Gamma-ray astronomy

    [gam-uh-rey] /ˈgæm əˌreɪ/ noun 1. the branch of astronomy that deals with the study of celestial objects by means of the gamma rays that come from them. noun 1. the investigation of cosmic gamma rays, such as those from quasars



  • Gamma-ray burst

    noun 1. a short-lived, extremely luminous burst of gamma radiation from an unknown astronomical source, occurring at random positions in the sky several times a day. Abbreviation: GRB. noun 1. (astronomy) an intense but short-lived burst of gamma rays from an unknown celestial source. First detected in 1970, they have since been found to be […]

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    noun 1. any of the third rank of active securities on the London Stock Exchange. Prices displayed by market makers are given as an indication rather than an offer to buy or sell



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