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In any event, it must be emphasized once again that radiocarbon dating has no relevance one way or the other for the overall question of whether the earth is many millions of years old, since the scheme can only be used to reliably date specimens less than approximately 50,000 years old.Additional background is available in a well-written Wikipedia article on the topic [Radiocarbon2011], and in Richard Wiens' article [Wiens2002].

However, in the scientific results mentioned by Brown, the dates come from different mammoth specimens.

Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.

Green plants absorb the carbon dioxide, so the population of carbon-14 molecules is continually replenished until the plant dies.

Carbon-14 is also passed onto the animals that eat those plants.

After death the amount of carbon-14 in the organic specimen decreases very regularly as the molecules decay.

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  1. Jun 24, 2016. Scientists at the New Mexico Office of Archaeological Studies use a Low Energy Plasma Radiocarbon Sampling device on a sample of gelatin at its lab near Santa Fe. The machine is used to date artifacts by doing minimal damage to the sample. Eddie Moore/Albuquerque Journal.

  2. Apr 6, 2015. Developed by the University of Liverpool, the new technique uses a Quadrupole Mass Spectrometer, which will reduce the time it takes to get carbon-dating results from a number of weeks to just a couple of days. Even better than that, it can be used on site without needing to send samples away.

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