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An instrument used in medicine to produce images of internal organs after the injection of a radioactive drug into the body, where the drug releases gamma rays. It is used especially in medical diagnostic scanning. (Encarta Dictionary and Merriam-Webster Online Dictionary)
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The original gamma camera invented by H. O. Anger in 1957 and its subsequent generations. This original camera consisted of one large crystal in which gamma rays were converted to scintillations of light. Then, a limited number of detectors viewed these through a collimator to provide an image.
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