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what are gamma ray given off by?....

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Docters use gamma camera to read lungs.

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They have the highest energy wave, and shortest wave length. they are thought of photons. Have greater energies than about 100 KeV.

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Gamma ray also cause mutations in growing tissues,so unborn babies are especially vulnerable.

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Gamma ray also cause mutations in growing tissues,so unborn babies are especially vulnerable.

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Gamma ray cause cell damage and can cause a variety of cancers.

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The highest energy, shortest wavelength electromagnetic radiations. Usually, they are thought of as any photons having energies greater than about 100 keV.  Gamma Ray Detection Like X-ray detection, gamma-ray detection is done on a photon-by-photon basis. Hard work by several brilliant scientists had shown us that a number of different processes which were occurring in the Universe would result in gamma-ray emission.

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Gamma rays are given off by stars, and by some radioactive substances. The 'low notes' have a low frequency and a long wavelength.
The 'high notes' have a high frequency and a short wavelength.