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  • 1 North China Institute of Radiation Protection Taiyuan Shanxi People's Republic of China
  • 2 New York University Medical Center Institute of Environmental Medicine 550 First Avenue 10016 New York N. Y. USA
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A manganese dioxide coprecipitation procedure is utilized to replace a time-consuming evaporation step for the extraction of thorium, uranium and cerium from freshwater samples. The average recovery for 20-liter samples is greater than 95% for234Th and144Ce. The data indicate that the manganese dioxide coprecipitation process does not affect the recovery of thorium and uranium during our routine analytical procedure.