Exposure

The term exposure refers to the concentration, in air, of radiation at a specific point and is the ionization produced in a specific volume of air: E = Q / m where E is exposure, Q is the quantity of charge on the ions and m is the unit mass of air.

Exposure describes the ability of X-rays to ionize air. It was historically measured in roentgens (R), however the SI unit is the coulomb per kilogram (C kg-1):

  • 1R = 2.58×10−4 C kg-1

It is typically measured with an ionization chamber.

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Article Information

rID: 18982
Section: Physics
Tags: stub, refs
Synonyms or Alternate Spellings:

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