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The half-life of uranium-238 is 4500 million years.

When it decays it forms thorium-234 which is also unstable.

Thorium extraction efficiencies were greater than 90 % and reproducible.

The quantities of Th introduced by the chemical purification procedure were negligible.

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At many sites throughout the world rock art paintings have been covered by naturally deposited calcite laminations, which we demonstrate can be individually dated by recently improved uranium-series methods.

Here we report the application of multi-collector inductively coupled plasma mass spectrometry to measure the ages for carbonate coatings that bracket red pigment at Lene Hara cave, East Timor, which could be evidence of human painting.

Topics range from magma chamber evolution and volcanic hazard prediction, global climatic change through dating of authigenic carbonate deposits, human evolution through dating of bone, to the study of groundwater evolution.Uranium dating is one of the ways of determining the age of ancient objects, even one million years old, by measuring how much of the following are present in them: the amount of radioactive isotopes of uranium, and the amount of other materials into which the radioactive isotopes would decompose.These measurements, when combined with knowledge about the initial state of matter under study (that is, composition at the time of death of an organism, or formation of a mineral) and the rate at which radioactivity takes place, would yield the age of the object.Even though it decays into nitrogen, new carbon-14 is always being formed when cosmic rays hit atoms high in the atmosphere.Plants absorb carbon dioxide from the atmosphere and animals eat plants.




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