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Atmospheric radiocarbon calibration beyond 11,900 cal BP from Lake Suigetsu.

Mass-spectrometric 230Th-234U-238U dating of the Devils Hole calcite vein.

Both U-238, and C-14 (radiocarbon, for carbon dating) are used to estimate the age of certain types of matter.

These atoms decay, and from the amount of atoms remaining, an estimate of the…

500 ka precipitation record from southeastern Australia: evidence for interglacial relative aridity. The U stands for Uranium which is a radioactive metal and the 238 stands for what number of isotope. It is very similar to U-235, which is used in nuclear reactors. Depleted Uranium, 0.2% U-235 99.8% U-238: Armor piercing antitank Gatling gun bullets and tank armor plate Highly Enriched Uranium, 93.5% U-235 6.5% U-238: Fission bomb cores Reactor Produced Uranium, 238 represents the atomic mass of Uranium.It occurs naturally as U-238 with a very small amount of U-235, when U-235 is refined out it is called depleted… Yes, it is used but the rest of the above answer is entirely wrong. Uranium's standard isotope (which is U-238) is composed of 92 Protons ( charges) and 146 Protons (- charges).U at the time of sample formation must be known or calculated. With time, Thorium 230 accumulates in the sample through radiometric decay.

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