Title: exposure
Long Title: IUPAC Gold Book - exposure
DOI: 10.1351/goldbook.ET02276
Status: current

Definition
For X- or gamma-radiation in air: the sum of the electrical charges of all the ions of one sign produced when all electronss liberated by photonss in a suitably small element of volume of air completely stopped, divided by the mass of the air in the volume element.

Related Terms
- X-: https://goldbook.iupac.org//terms/view/X06703
- electrons: https://goldbook.iupac.org//terms/view/E01975
- gamma-radiation: https://goldbook.iupac.org//terms/view/R02568
- ions: https://goldbook.iupac.org//terms/view/I03158
- photons: https://goldbook.iupac.org//terms/view/P04627

Source
- PAC, 1982, 54, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1541 (https://doi.org/10.1351/pac198254081533)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/ET02276/html
- json: https://goldbook.iupac.org/terms/view/ET02276/json
- xml: https://goldbook.iupac.org/terms/view/ET02276/xml

Citation: Citation: 'exposure' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.ET02276
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Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.
Accessed: 2026-04-22T12:55:56+00:00