We have measured the stable isotope ratios of carbon in a suite of recent cave deposits (< 200 years) from the San Saba County, Texas, USA. The methodology for dating these deposits using excess 210pb was recently established [Baskaran and Iliffe, 1993]. The carbon isotope ratios of these samples, spanning the thne period -• 1800-1990 AD, reflect the carbon isotope ratio of atmospheric CO2 for ...

The accurate determination of the levels 210Pb in environmental samples (e.g. atmospheric aerosols, waters, soils, biota, etc.) is essential due to its multiple applications geochronology, radiation protection, groundwaters flows, air masses movement, etc. For this purpose, it has been developed a novel and thorough study three alternative radiometric measuring methods activity concentrations s...

The uppermost 50 cm of the high resolution core GeoB9501-4 from the continental slope off NW Africa has been used for improving routine technique of 210Pb and 137Cs sediment chronology in the Radioactivity measurement laboratory of the Bremen University. The experimental requirements for 210Pb and 137Cs determination were non-destructive analysis of wet sediment samples in cylindrical container...