isotope and the stable 
isotope. [P9.2]
is: a method of dating (finding the age of) a sample that contains carbon absorbed from the atmosphere. The age is obtained by finding the relative amounts of the radioactive isotope and the stable isotope. [P9.2]
is used mainly: in archaeology and for studies of relatively recent geological events (less than 
years ago). It can give the age of wood, shell, bone and other forms of organic material. [P9.2]
is also known: as carbon dating. [P9.2]
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