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radiation units



The roentgen ® is defined as a unit of radiation exposure that will liberate a change of 2.58 x 10-4 Coulombs per kilogram of air.


The rad is the unit of absorbed dose. One rad is equal to the radiation necessary to deposit energy of 100 ergs in 1 gram of irradiated material.
Gray (Gy) is the SI unit for absorbed dose
1 Gy = 100 rads
1 rad = 1 c. Gy (Centigray)


The rem is a unit of absorbed dose equivalent. The rem is a unit used only in radiation protection.
The rem is a measure of the biological effectiveness of radiation.
SI unit of absorbed dose equivalent is Sievert.

1 Sievert (Sv) = 100 rems
Rem = Rads x Quality factor
B/ c the quality factor for Xray is 1 , therefore diagnostic energy levels.
1R = 1 rad = 1 rem
radiation units Reviewed by Sumer Sethi on Sunday, September 12, 2004 Rating: 5

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