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This article is about the radiation unit. For the angular unit, see radian. rad Unit system CGS units Unit of Absorbed dose of ionizing radiation Symbol rad Conversions 1 rad in ... ... is equal to ... SI base units 0.01 J⋅kg−1 SI units 0.01 Gy CGS 100 erg/g
The rad is a unit of absorbed radiation dose, defined as 1 rad = 0.01 Gy = 0.01 J/kg. It was originally defined in CGS units in 1953 as the dose causing 100 ergs of energy to be absorbed by one gram of matter. The material absorbing the radiation can be human tissue or silicon microchips or any other medium (for example, air, water, lead shielding, etc.).
It has been replaced by the gray (Gy) in SI derived units, but is still used in the United States, although this is "strongly discouraged" in Chapter 5.2 of the Guide to the SI, which was written and published by the U.S. National Institute of Standards and Technology. dagowil5@gmail.com
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| Source | https://www.flickr.com/photos/tylerstefanich/2117633427/ |
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