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A statistical analysis is made of 83 values of the Fe3+ extinction coefficient in direct 'liV spectrophotometry. Six of these coefficients have been obtained in this work by the same experimentalists and equipment by varying the source of standard ferric solution. The results show that errors in Fricke dosimetry arise from the preparation of the reference Fe37 solution as well as in the spectrophotometer. The effect of KaCI on the extinction coefficient is shown to be negligible in 0.8 N but not in 0.1 N H$04 solution. A recommended procedure of establishing the Fe3+ extinction coefficient is proposed.

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