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Isotope levels can be measured extremely accurately, much more accurately than when carbon-dating methods were first devised.
However, this doesn’t mean that carbon-dating is any more reliable.
Note that the ‘natural level’ in the graph above is assumed.A carbon age of thousands of years in the future like the one you described could indicate that the wood in question was cut/separated from the tree in the 1960s, when atmospheric radiocarbon levels were at their highest.(There are other phenomena besides nuclear bombs that also affect carbon isotope levels—see later.) Several examples of future carbon dates appear in some research done on silk cloth.Repeated sample and got the same results.’ Testing of atmospheric nuclear bombs in the 1950s and 60s dramatically increased levels of radiocarbon (carbon-14, C) in the atmosphere—see the graph below.Measurements have always shown fluctuations in the level of atmospheric radiocarbon, but since the peak in the mid 1960s, the level has been steadily decreasing overall.
More and more archaeologists are beginning to accept that revision is inevitable.