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In addition, samples need to be thoroughly cleaned before dating. If 1 percent of the carbon in a 50,000-year-old sample is polluted, the date could be off by 10,000 years.Because of this, scientists are always working on better ways to clean materials.These two measures of time will only be the same if all of the assumptions which go into the conventional radiocarbon dating technique are valid.

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This means that although they are very similar chemically, they have different masses. Climate records from a Japanese lake are set to improve the accuracy of the dating technique, which could help to shed light on archaeological mysteries such as why Neanderthals became extinct.Carbon dating is used to work out the age of organic material — in effect, any living thing.Scientists once thought Rapa Nui was settled from A. 300 to 1200, but radiocarbon dating has now shown that it was settled from 700 to 1100. As a result, every plant and animal in the chain has the same amount of 14C relative to other types of carbon. After 55,000 years, so much 14C is gone that there is not enough left to measure.These large volcanic stone statues, or moai, are now believed to have been carved from 1100 to 1680, based on radiocarbon dating. It is called Carbon-14 (14C) or "radiocarbon." It is radioactive, so it breaks down over time. Carbon-14 breaks down at the same speed no matter what. We can figure out how much time has passed by comparing how much 14C a human bone has now relative to how much it had when the person died. It takes 5,730 years for half of the 14C in a sample to break down.

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