Oxygen 18 Dating

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Oxygen-18 - Wikipedia
Paleoclimatology: The Oxygen Balance - NASA
Oxygen isotope ratio cycle - Wikipedia
Ice core dating using stable isotope data - University of . . .
Oxygen 18 dating 24 - Associação Porto Seco
Oxygen-18 Stability in Foraminifera fossils, implications . . .
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Oxygen-18 ( 18 O, Ω) is a natural, stable isotope of oxygen and one of the environmental isotopes . . 18 O is an important precursor for the production of fluorodeoxyglucose (FDG) used in positron emission tomography (PET) . Generally, in the radiopharmaceutical industry, enriched water (H 2 18 O) is bombarded with hydrogen ions in either a cyclotron or linear accelerator, creating fluorine- 18 .
The Oxygen-18 isotope has an extra two neutrons, for a total of 10 neutrons and 8 protons, compared to the 8 neutrons and 8 protons in a normal oxygen atom . The slighty greater mass of 18 O—12 .5 percent more than 16 O—results in differentiation of the isotopes in the Earth's atmosphere and hydrosphere .
Oxygen isotope ratio cycles are cyclical variations in the ratio of the abundance of oxygen with an atomic mass of 18 to the abundance of oxygen with an atomic mass of 16 present in some substances, such as polar ice or calcite in ocean core samples, measured with the isotope fractionation .The ratio is linked to water temperature of ancient oceans, which in turn reflects ancient climates .
In the following, dating using oxygen isotope data (δ 18 O) is described, although exactly the same techniques can be applied when using hydrogen isotope data (δD) . The annual cycle in δ 18 O is connected to local or regional temperature variations and is a very reliable indicator of the seasonal temperature cycle . The graph below shows how . . .
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By Andy May . 18 O is a rare isotope of oxygen . The ratio of 18 O to the normal 16 O in foraminifera fossils ("forams") can be used to estimate paleo-ocean temperatures . Higher values mean lower temperatures . A recent article on geologypage .com led me to Bernard, et al ., 2017, which has experimental data that suggest 18 O concentrations can be altered in fossils by solid-state diffusion . . .
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