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A G-value is defined as the number of molecules available for homogeneous chemical reactions per 100 eV absorbed radiation energy.
The G-values varies with LET, temperature, dose rate and solute concentration. The survey article (A.J. Elliot, Rate Constants and G-Values for the Simulation of the Radiolysis of Light Water over the Range 0-300ºC, AECL-11073, COG-94-167) is recommended as an introduction to the subject.
A set of G-values must in itself be in mass balance and charge balance.
As an example the G-values for gamma radiation of light water, pH 7 and room temperature are:
Note that e- contains one water molecule.
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