carbon dating

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Legend has it that the tree is 7000 years old, but Sussman has found carbon-dating studies indicating it is a mere 2200 years old.
传说这种树已经7000岁了，但是苏斯曼发现碳测年的结果表明它只有2200年的历史。
The archaeologists said in the statement that radio-carbon dating put the construction of the circle of bluestones at between 2,400 B.C. and 2,200 B.C., a few centuries later than originally thought.
考古学家在一份声明中说，经放射性碳测年法鉴定，环形巨石阵应该建造于公元前2400年至公元前2200年之间，比之前的推测晚了几百年。
According to the result of environment tritium math-physical model and carbon-14 age dating, think the renew ability of the thermal water in study area is confined and inhomogeneity.
根据环境氚的数学物理模型计算和碳-14测年结果，关中盆地热水可更新性具有有限性和非均一性特点。

The team collected pieces of the coral and then used radio-carbon dating methods to find their age.

Although there were no machines for detecting them systematically before 1935, cosmic rays have left their footprints in the geological record by creating radioactive elements such as the carbon-14 used in carbon-dating.
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To do the sleuth work for the various lawsuits, Koch has assigned private investigators (who he described as ex-CIA and ex-FBI agents) tasks ranging from tracking down printers of counterfeit wine labels, to carbon-dating bottles and listening in on a phone call with Greenberg.
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a method of calculating the age of extremely old objects by measuring the amount of a particular type of carbon in them

Carbon dating is a system of calculating the age of a very old object by measuring the amount of radioactive carbon it contains.