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  1. Health effects

    A dose of under 100 rad will typically produce no immediate symptoms other than blood changes. A dose of 100 … See more

    Rad (radiation unit) - Wikipedia

    • 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, air, water, or any other substance. It has been replaced by the gray (symbol Gy) in SI derived u… See more

    History

    In the 1930s the roentgen was the most commonly used unit of radiation exposure. This unit is obsolete and no longer clearly defined. One roentgen deposits 0.877 rad in dry air, 0.96 rad in soft tissue, or anywhere fr… See more

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