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Large Scale Fixed Bed Ion-Exchange System for Removing Iodine-131 and Strontium-90 from Milk¹

Producers Creamery Company, Springfield, Missouri

R. E. Bales

National Center for Radiological Health, Public Health Service, U.S. Department of Health, Education, and Welfare

ABSTRACT

A large scale fixed bed ion-exchange system for removing ⁹⁰Sr and ¹³¹I from fluid milk is described. In one abbreviated trial and three full-scale trials, 149,000 liters of milk were processed at flow rates averaging up to 8.600 liters/hour. Radionuclide removal efficiency averaged 98.9% for ¹³¹I, 94.6% for ⁸⁵Sr, and 90.0% for ⁹⁰Sr. Although not an object of the study, it was found in one run that 66% of the environmental ¹³⁷Cs was also removed by the cation column. Some decrease in flavor score was noted, particularly in the first milk through the anion resin column. Bacterial studies indicated that a slight increase in psychrophil counts occurred during processing. Chemical and physical compositional changes in milk passed through the ⁹⁰Sr and ¹³¹I combined ionexchange system were approximately the same as for milk passed through the ⁹⁰Sr system alone.

¹ This investigation was supported by Contract no. PH-86-65-127 with the National Center for Radiological Health, U.S. Public Health Service.