"Exposure describes the ability of x-ray photons to ionise air and cannot be used for protons, neutrons or electrons. Exposure decreases with the square of the distance from an x-ray source (inverse square law). It was historically measured in roentgens (R), however the SI unit is the coulomb per kilogram (C kg-1) which lacks an eponym:"
"1 roentgen = 2.58×10−4 C kg-1"
"The term exposure refers to the concentration, in air, of x-rays at a specific point and is the ionisation 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-ray photons to ionise air and cannot be used for protons, neutrons or electrons. Exposure decreases with the square of the distance from an x-ray source (inverse square law). It was historically measured in roentgens (R), however the SI unit is the coulomb per kilogram (C kg-1) which lacks an eponym:"
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"Exposure describes the ability of x-ray photons to ionise air and cannot be used for protons, neutrons or electrons. Exposure decreases with the square of the distance from an x-ray source (inverse square law). It was historically measured in roentgens (R), however the SI unit is the coulomb per kilogram (C kg-1) which lacks an eponym:"