Determination of iodine-131 at low levels in milk: collaborative study.

The official method for the determination of iodine-131 in milk has a lower limit of detection (LLD) of 10 pCi/L (0.37 Bq/L). The Nuclear Regulatory Commission had recommended that a method claiming to have an LLD of <0.

Gamma-ray spectroscopic determination of iodine-131 and cesium-137 in foods: two collaborative studies.

The AOAC method for iodine-131, cesium-137, and barium-140 in milk by gamma-ray spectroscopy (48.025-48.029) was extended to include other foods for the radionuclides iodine-131 and cesium-137.

Quantitative determination of I-131, Cs-137, and Ba-140 in milk: collaborative studies.

The official method for Cs-137 in milk by gamma-ray spectroscopy was extended to include I-131 and Ba-140. A collaborative study was performed on this method applied to I-131 concentration in cow's milk; the original collaborative study of the method including all 3 nuclides was reviewed. In the I-131 study, 1 aliquot of a milk sample containing 82 pCi/L was sent to each of 60 laboratories for triplicate analyses.