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The tiny initial amount of C14, the relatively rapid rate of decay (the half-life of C14 is currently about 5700 years) and the ease with which samples can become contaminated make radiocarbon dating results for samples "older" than about 50,000 years effectively meaningless.This limit is currently accepted by nearly all radiocarbon dating practitioners.(Photo: Sagnlandet Lejre)Danish Stone Age settlements may turn out to be hundreds, perhaps thousands, of years younger than we thought.
Hard water contains high levels of calcium carbonate. However, depending on ocean water circulation, fish and other living creatures can incorporate 'older' carbonate (with less carbon-14) into their bodies.The proton takes an electron with it and becomes an atom of hydrogen.The nitrogen atom, which began with seven protons and seven neutrons, is left with only six protons and eight neutrons.Radiocarbon dating is frequently used to date ancient human settlements or tools. It is a stable atom that will not change its atomic mass under normal circumstances.
BASIS OF RADIOCARBON DATING Radiocarbon dating compares the amount of normal carbon with the amount of radioactive carbon in a sample.
It turns out that the widely-used Carbon-14 dating method may be up to 2,000 years off the mark.”We had not expected to see an effect of 2,000 years.