Rad (unit)
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.The rad (radiation absorbed dose, symbol rad) is a largely obsolete unit of absorbed radiation dose, equal to 10 milligrays. The rad was first proposed in 1918 as "that quantity of X rays which when absorbed will cause the destruction of the [malignant mammalian] cells in question..." It was defined in CGS units in 1953 as the dose causing 100 ergs of energy to be absorbed by one gram of matter. It was restated in SI units in 1970 as the dose causing 0.01 joule of…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.The rad (radiation absorbed dose, symbol rad) is a largely obsolete unit of absorbed radiation dose, equal to 10 milligrays. The rad was first proposed in 1918 as "that quantity of X rays which when absorbed will cause the destruction of the [malignant mammalian] cells in question..." It was defined in CGS units in 1953 as the dose causing 100 ergs of energy to be absorbed by one gram of matter. It was restated in SI units in 1970 as the dose causing 0.01 joule of energy to be absorbed per kilogram of matter.The United States Nuclear Regulatory Commission requires the use of the units curie, rad, and rem as part of the Code of Federal Regulations 10CFR20.However, it is now superseded in the SI by the gray; 1 rad is equal to 10 milligrays, and 300 krad are equal to 3 kGy. The continued use of the rad is "strongly discouraged" by the author style guide of the U.S. National Institute of Standards and Technology.