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Many minerals contain radioactive K-40 (potassium 40) isotopes, which decay at a known rate into Ar-40 (argon 40) gas.
Scientists use a device called a spectrometer to measure the accumulation of Ar-40 in relation to amounts of K-40.
This date would mean that men lived during the time of the dinosaurs and would upset the evolutionary timescale.
So new samples were sent and finally a date of 2.4 million years was eventually accepted (Since evolutionary theory is generally assumed to be true, it is to be expected that dates that do not fit the evolutionary timescale will be reexamined or dismissed.
Radiocarbon decays slowly in a living organism, and the amount lost is continually replenished as long as the organism takes in air or food.
Once the organism dies, however, it ceases to absorb carbon-14, so that the amount of the radiocarbon in its tissues steadily decreases.
But does this assumption lead to circular reasoning and wrong conclusions?
They normally use radiometric dating methods to date the fossil, and many promote these methods as being accurate.Geologists use this method to date volcanic rocks that may be as much as 4 billion to 5 billion years old.Potassium is one of the most abundant elements in the earth’s crust.explains: “Carbon-14 dating, also called radiocarbon dating, [is a] method of age determination that depends upon the decay to nitrogen of radiocarbon (carbon-14).
Carbon-14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earth’s atmosphere; the neutrons required for this reaction are produced by cosmic rays interacting with the atmosphere. is absorbed from the air by green plants and then passed on to animals through the food chain.The ratio of these elements can indicate the age of a geologic layer, generally since it last underwent a metamorphosis, such as melting under the heat of molten lava from a volcanic eruption.