What is An Exposure In Radiology?
Exposure is the amount of ionization produced in air when ionizing radiation is present. The air at the surface of an x-ray room tabletop or the interior of a computed tomography (CT) scanner becomes ionized when the x-ray tube is energized.
Devices called ionization chambers can measure this quantity directly and are used to determine the amount of radiation produced by x-ray equipment. Exposure is measured in coulomb per kilogram (C/kg) in the metric International System of Units (SI), or in milli roentgens (mR), a sub unit of the roentgen, a non metric unit like wise used for measuring the ionizing capability of radiation. A milli roentgen is equal to 1/1000 of a roentgen.
- 1 roentgen = 2.58×10−4 C kg-1
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