Scientists place great faith in this dating method, and yet more than 50% of radiocarbon dates from geological and archaeological samples of northeastern North America have been deemed unacceptable after investigation.While there is no proof that the rates were different in the past than they are today, there is also no proof that they were the same.
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d) Even if the rate of decay is constant, without knowledge of the exact ratio of carbon-12 to carbon-14in the initial sample, the dating technique is subject to question.
It's assumed that the clock was set to zero when the study material was formed.
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However, conditions may have been different in the past and could have influenced the rate of decay or formation of radioactive elements.