Abstract
A systematic error in the spectrophotometric measurement of ferric ion concentrations in the ferrous sulphate dosemeter may be made by an incorrect evaluation of a non-linear spectrophotometric calibration curve. Methods are discussed for determining the radiation-produced change in molarity from the actual calibration curve, and a method of normalization of measured absorbances is suggested. Normalization factors, converting measured absorbances into normalized values, can either be calculated by choosing a reference value of the molar extinction coefficient, or can be determined by comparative absorbance measurements on two spectrophotometers, one of them to be a precision instrument. Normalized absorbances are proportional to molarity and may be considered to be free of errors due to instrumental parameters and inaccuracies in acidity and temperature of solutions, and of errors in molarity if derived by comparative measurements.
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