Tree ring dating

Tree Ring Dating The Institute for Creation Research

Results of carbon-14 dating are reported in radiocarbon years, and calibration is needed to convert radiocarbon years into calendar years.

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Uncalibrated radiocarbon measurements are usually reported in years BP where 0 (zero) BP is defined as AD 1950.

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BP stands for “Before Present” or “Before Physics” as some would refer to it.It is also worth noting that the half-life used in carbon dating calculations is 5568 years, the value worked out by chemist Willard Libby, and not the more accurate value of 5730 years, which is known as the Cambridge half-life.

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It should be noted that a BP notation is also used in other dating ques but is defined differently, as in the case of thermoluminescence dating wherein BP is defined as AD 1980.


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