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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The country code for Guyana.
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grayA unit of measurement of absorbed radiation. Part of the SI system of measurement, one gray (Gy) is equal to one joule per kilogram. The gray is 100 times greater than the "rad," which was the unit of measurement it replaced. See joule, SI units and radiation hardened.
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