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"Radiocarbon ages" are calculated from f M using the exponential decay relation and the "Libby half-life" 5568 a.

The ages are expressed in years before present (BP) where "present" is defined as AD 1950.

The new method is based on the fact that over the past 60 years, environmental levels of radiocarbon have been significantly perturbed by mid-20th-century episodes of above-ground nuclear weapons testing.

Before the nuclear age, the amount of radiocarbon in the environment varied little in the span of a century.

Radiocarbon dating involves determining the age of an ancient fossil or specimen by measuring its carbon-14 content.Before Present (BP) years is a time scale used mainly in geology and other scientific disciplines to specify when events occurred in the past.Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date of the age scale, reflecting the fact that radiocarbon dating became practical in the 1950s.The older an organism's remains are, the less beta radiation it emits because its C-14 is steadily dwindling at a predictable rate.So, if we measure the rate of beta decay in an organic sample, we can calculate how old the sample is. Question: Kieth and Anderson radiocarbon-dated the shell of a living freshwater mussel and obtained an age of over two thousand years.ICR creationists claim that this discredits C-14 dating. Answer: It does discredit the C-14 dating of freshwater mussels, but that's about all.