Fricke Dosimeter: bookkeeping
Each hydrogen radical causes the oxidation of three molecules of errous ion
H2O2 produced by radiolysis will oxidize two ferrous ions--one direct, one indirect.
A radiolytically-produced OHï radical gives rise to one more oxidation.
Therefore at acidic pH with oxygen:G(Fe3+) = 2G(H2O2) + 3G(H) + G(OHï)