radiocarbon

/rey-dee-oh-kahr-buhn/US // ˌreɪ di oʊˈkɑr bən //UK // (ˌreɪdɪəʊˈkɑːbən) //

放射性碳素,放射性碳元素,放射性碳水化合物,辐射碳

Definitions

n.名词 noun

1
Chemistry.
- : Also called carbon 14. a radioactive isotope of carbon with mass number 14 and a half-life of about 5730 years: widely used in the dating of organic materials.
- : any radioactive isotope of carbon.

New radiocarbon dating places his death at between 3,391 and 3,031 years ago.
To figure out how long ago the soil samples had frozen, the team used radiocarbon dating.
Because radiocarbon isotopes decay to the point of near disappearance around the 50,000 year mark, packrats can’t help us pin dates to organisms that existed before that threshold—say, dinosaurs.
The ancient DNA came from a tooth and two bone fragments radiocarbon dated to between around 43,000 and 46,000 years ago.
“The correlation of the radiocarbon dates with periods of drought is remarkable,” Mills says.
Could modern human DNA contamination affect the resultant radiocarbon date?
Most all investigators accept these radiocarbon dates on the elk antlers as rock solid.
Some of the carbon compounds in the various artifacts showed a faint trace of radiocarbon, others showed none.
Philon went on to explain the radiocarbon dating of the book.