Relationship between 129I and 127I contents in bovine thyroid glands from Argentina

Abstract 129 I/ 127 I ratios and iodine concentrations in bovine thyroids stemming from Argentina were determined by accelerator mass spectrometry (AMS) and gas chromatography (GC), respectively. From these measurements, a relationship of the 129 I/ 127 I ratio with iodine content in the gland was obtained. A weak correlation between the two isotopes was found, suggesting that 129 I re-emission from the ocean is not the only process for the 129 I deposition in Argentina. Moreover, contributions to the total 129 I inventory in the Southern hemisphere from both natural and anthropogenic sources were theoretically studied. Surface compartments present similar contribution from natural sources and nuclear explosions fallout.