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Home > Gray (unit)

A gray, (symbol: Gy), is the SI unit of energy for the absorbed dose of radiation. One gray is the absorption of one joule of radiation energy by one kilogram of matter. One gray equals 100 rad, an older unit .

It was defined in 1940 by Louis Harold Gray (1905-1965) as “that amount of neutron radiation which produces an increment of energy in unit volume of tissue equal to the increment of energy produced in unit volume of water by one röntgen of radiation”

Based in part on this slide, with permission.

SI derived units Units of energy Units_of_radiation_dose

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Topics: Gray (unit), Gray Whale, Gray Code, Grays Harbor County...

Gray WhaleThe Gray Whale Eschrichtius robustus is a whale which travels between feeding and breeding grounds yearly. It reaches a length of about 15 meters, a weight of 36 tons and an age of 50-60 years. Gray Whales were once called devil fish because of their fighGrayThe word gray is also spelled grey see Grey for topics with this spelling. Gray or grey is a color created by mixing white and black in different proportions. Gray (unit) the absorbed dose of radiation named after Louis Harold Gray. Gray, France is a townGray codeA Gray code is a binary numeral system where two successive values differ in only one digit, originally designed to prevent spurious output from electromechanical switches. Motivation Many devices indicate position by closing and opening switches. If that
Grays Harbor County, WashingtonGrays Harbor County is a county located in the U. state of Washington. As of 2000, the population is 67,194. The county seat is at Montesano. It is named after Captain Robert Gray, who discovered the harbor that bears his name in 1792. Geography AccordingGrayson County, VirginiaGrayson County is a county located in the State of Virginia. As of 2000, the population is 17,917. Its county seat is Independence 6. Geography According to the U. Census Bureau, the county has a total area of 1,155 km² (446 mi²). 1,146 km² (443 mi²) of iGrayson County, TexasGrayson County is a county located in the U. State of Texas. As of 2000, the population is 110,595. Its county seat is Sherman 6. Grayson county is named for Peter Wagener Grayson, an attorney general of the Republic of Texas. Geography According to the U
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Gray DavisGrayson Valley, AlabamaGraysville, Alabama
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