The method for potentiometric estimation of megarad dose with the ceric-cerous dosimetry system has been discussed in this paper. The difference in electrochemical potential between irradiated and unirradiated solution was used for the measurement of absorbed dose instead of the complex spectrophotometric procedure. Results for the doses ranging from 10 to 20 kGy are presented that the data obtain from the potentiometry with single distilled water and container without special cleaning are agreement within 4.5% with that from the Fricke system. Since electrodes and a pH meter used in the method are very popular in a common chemical laboratory and dilution is not required on the ceric-cerous dosimeter solution, the potentiometry of the ceric-cerous system is very suitable for routine dose measurement on radiation processing.