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  • 1 Pakistan Institute of Nuclear Science & Technology (PINSTECH) Health Physics Division P. O. Nilore Islamabad Pakistan
  • 2 Nuclear Institute for Food and Agriculture, Turnab P. O. Box No. 446 Peshawar Pakistan
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A comprehensive radiochemical procedure for the measurement of gamma/beta activity of131I has been standarized by optimizing different steps. The procedure is mainly divided into three stages, i.e., (1) concentration of iodine using anion exchange column followed by elution; (2) extraction of iodine into CCl4 and back extraction, and (3) precipitation as AgI. The percent chemical recovery and the lower limit of detection (LLD) were found to be 75.5±5% and 0.014 mBq/ml, respectively.