By Bernard Bourdon
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Extra info for Uranium-series geochemistry
1987). Samples for single filaments were typically loaded as dilute HCl or HNO3 solutions between layers of colloidal graphite, called the graphite sandwich method. In this case, the graphite provides a reduced environment and samples are analyzed as the U+ and Th+ metal species at temperatures around 1700°C and 1900°C, respectively. Because ionization efficiency for this method is quite negatively correlated with sample size loaded, particularly for Th, triple filament configurations provide better ionization efficiency for larger U and Th samples (Goldstein et al.
2 Techniques for Measuring Uranium-series Nuclides: 1992-2002 Steven J. gov Claudine H. ch 1. INTRODUCTION Advances in geochemistry and geochronology are often closely linked to development of new technologies for improved measurement of elemental and isotopic abundance. At the beginning of the past decade, thermal ionization mass spectrometric (TIMS) methods were just beginning to be applied for long-lived uranium-series nuclide measurement (Edwards et al. 1987; Goldstein et al. 1989; Bard et al.
Laser ablation. A laser ablation system can be used in place of solution nebulization as the sample introduction system. During laser ablation sampling, the high-energy laser beam produces a micro-plasma from the sample and nebulizer gas that ablates the sample surface. The sample is enclosed by an optical cell, through which the laser beam may pass undisturbed. Typically, the cell is mounted on a stage that can be rotated or moved in the x, y and z directions by computer control, and several samples can be loaded simultaneously to minimize sample changeover time.
Uranium-series geochemistry by Bernard Bourdon