gamma rays pl. n. electromagnetic radiation of wavelengths shorter than X-rays, given off by certain radioactive substances. Gamma rays used in nuclear medicine have higher energy than diagnostic X-rays and greater penetration; higher doses are used in radiotherapy. Gamma rays are harmful to living tissues and can be used to sterilize certain materials and to kill bacteria as a means of food preservation.
gamma rays Electromagnetic radiation, about 10−10 to 10−14 m in wavelength, similar to, but of shorter wavelength than X-rays, which is emitted by radioactive substances.
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