The U-series decay chains contain many elements that can be fractionated in environmental and geological processes.
Half-lives of radioactive isotopes of such elements range from seconds to many millennia and application depends on the natural timeframe of the process or the elapsed time.
(1989), which suggests that the closer a site is to Sellafield, the higher is the concentration of plutonium in the silt.
Some relationship between distance and activity can be seen in their data, when fitted to an exponential curve, but the scatter of the points is large (R The additional radioactivity in the biosphere caused by human activity due to the releases of man-made radioactivity and of Naturally Occurring Radioactive Materials (NORM) can be divided into several classes.
Uranium-series (U-series) analyses are an essential component of many research projects in Earth and environmental science, oceanography, hydrology and science-based archaeology.
The first documented case of an asbestos related death was reported in 1906.This review will be limited to some aspects of the Ra system with half-lives of 245 kyr, 76 kyr and 1.6 kyr, respectively.In environmental systems, fractionation of uranium and thorium is a very efficient process because thorium is extremely insoluble while hexavalent uranium in oxidising conditions is relatively soluble.NPP data also indicate the potential presence of flax and other fiber processing.The Shizitan 29 data demonstrate how humans adapted to challenging local conditions throughout the LGM, allowing them to stay within this northerly region without migrating to warmer southern latitudes.