BP stands for “Before Present” or “Before Physics” as some would refer to it. Uncalibrated radiocarbon measurements are usually reported in years BP where 0 (zero) BP is defined as AD 1950. This video excerpt is part of Beta Analytic’s webinar: Isotopes 101: An Introduction to Isotopic Analysis Units of Measure, Half-life, and the Need for Calibration ![]() Disclaimer: This video is hosted in a third-party site and may contain advertising.
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