Investigation of the Spectrophotometric Method of Measuring the Ferric Ion Yield in the Ferrous Sulfate Dosimeter

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Abstract
The usual method of determining the ferric ion yield produced by ionizing radiation in the ferrous sulfate dosimeter, is the measurement of the absorbance (optical density) of the irradiated solution at a wavelength of 304 m[mu]. It is shown that it is possible to double the sensitivity of this method by measuring the absorbance at 224 m[mu] instead of at 304 m[mu], thus extending its measuring range to smaller radiation doses. The higher sensitivity is due to the higher molar extinction coefficient of ferric ions at 224 m[mu] which is 4565 liter mole -1 cm-1 compared with 2196 liter mole cm-1 at 304 m[mu]. Furthermore, the smaller temperature and acidity dependence of the molar extinction coefficient at 224 m[mu]. compared with that at 304 m[mu] increases the accuracy of this method.

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