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If 1% of the carbon in a 50,000 year old sample is from a modern contaminant, the sample will be dated to around 40,000 years.

Because of this, radiocarbon chemists are continually developing new methods to more effectively clean materials.

Australia has two machines dedicated to radiocarbon analysis, and they are out of reach for much of the developing world.The Bill & Melinda Gates Foundation is a Strategic Partner.more Radiocarbon dating has transformed our understanding of the past 50,000 years.Luckily, we can measure these fluctuations in samples that are dated by other methods.Tree rings can be counted and their radiocarbon content measured.

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