The Ferrous Sulfate Radiation Dosimeter: A Calorimetric Calibration with Gamma Rays

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Abstract
The ferrous sulfate radiation dosimeter (herein called the Fricke dosimeter) has been recalibrated by a calorimetric method in which assumptions regarding energy absorbed in the glass and the heat capacity of the calorimeter have been eliminated. The 100‐ev yield, G(Fe++→Fe+++), is 15.8±0.3 for Co60 gamma radiation in agreement with the Hochanadel‐Ghormley value. The result is compared with other G values reported in the literature and it is recommended that the low value be adopted for Co60 gamma radiation and for electrons in the 1—2 Mev range.