Radiocarbon dating dinosaurs
Carbon-14 has a half-life of about 5730 years, so researchers use the process to date biological samples up to about 60,000 years in the past.
Beyond that timespan, the amount of the original C formed by irradiation of nitrogen by neutrons from the spontaneous fission of uranium, present in trace quantities almost everywhere.
Because radiocarbon exists in significant quantities, far above the least count (margin of error) with our state-of-the-art AMS labs doing the tests, these results can !
The Radiocarbon field itself now widely acknowledges, and tries almost desperately to discount, that specimens supposedly millions and billions of years old will yield maximum carbon-14 ages of only thousands of years!
* Carbon 14 in Dinosaurs at Singapore's American Geophysical Conference: On how to date a dinosaur, Real Science Radio's Bob Enyart interviews Hugh Miller, a member of the international scientific team that presented at the 2012 AGU geophysical conference in Singapore, the carbon dating results from five respected laboratories around the world of bones from ten dinosaurs (from the Gobi Desert in China, from Europe, Alaska, Texas, and Montana). Yet each of these dinosaurs had plenty of radiocarbon (as expected in that virtually every relevant peer-reviewed paper on the topic confirms the presence of endogenous soft tissue in fossils; see Dinosaur Soft Tissue.com).
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Thus, when significant quantities of 14c are found, for example, in coal and dinosaur bones, as well as in diamonds, the least contamination-resistant 14c-rich specimens provide a constraint on the likelihood of contamination as a primary source for the modern carbon in other similarly-dated specimens.
As reported in the journal Radiocarbon in natural gas, coal, oil and other petroleum products.(See below, 42 minutes into Paul Giem's 2013 presentation.) If the contamination occurred 12,000 years ago, 10% of the bone would have to be replaced; 18,000 years ago, 20%; if it occurred 24,000 years ago, 40% of the bone would have had to be replaced, and if (in the evolutionary perspective) a mere 30,000 years ago, 80% of the bone would have to be replace by a contamination process.Thus, where researchers find , "There is no known natural mechanism by which collagen may be altered to yield a false age." And as of 2019, there is still no known mechanism to contaminate collagen with modern carbon.The assumption by evolutionary geophysicists proposes that the 14c in diamonds, coal, etc., must have come from neutron capture by carbon-13 or nitrogen-14.Theoretical physicist Lawrence Krauss told RSR's Bob Enyart (rsr.org/krauss) that 14c in allegedly million-year-old specimens is an "anomaly." However, an anomaly is something that deviates from what is standard, normal, or expected.
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As reported elsewhere also in limestone, fossilized wood, coal, marble, deep groundwater, geological graphite, Mesozoic-layer limestone, and the bones of dinosaurs including the ten described below.