Tandem-Accelerator Mass-Spectrometry Measurements of 36Cl, 129I and Osmium Isotopes in Diverse Natural Samples

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Tandem AMS measurements at Rochester in the past few years have mainly involved the radioisotopes 36Cl and 129I, and some work on 10Be, in a variety of terrestrial and extraterrestrial samples. Some measurements have also been made on certain stable isotopes of osmium in meteorites and geological samples from impact craters. Measurements of 36Cl have been made in groundwater and surface rocks for dating purposes, in ice and soil samples containing nuclear-weapon testing fallout for tracing water movement, and in meteorites and Antarctic ice for terrestrial and extraterrestrial meteoritic age determination. Also, 10Be has been measured in a lake sediment, and 36Cl in Greenland ice, through the period of the Maunder minimum; 129I has been measured in hydrological systems, in petroleum and in hydrothermal convection cells in the oceanic crust. Other applications involving measurements of these two radioisotopes include hydrothermal fluids associated with gold mineralization and the determination of the integrity of possible sites for deep nuclear-waste disposal. Previously, the Rochester tandem was employed to measure 14C and isotopes of platinum and iridium in natural samples.

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