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radiogold colloid

[ rādē-ō-gōld′ ]
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n.
A colloidal dispersion of a radioactive isotope of gold that emits a negative beta particle and a gamma ray for each atom of gold present, used for irradiating closed serous cavities and for liver scans.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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