( ( ( Carbon dating ) ( measures ( ( the amount ) ( of ( carbon 14 ) ) ) ) ) ( , ( ( ( a ( ( slightly radioactive ) isotope ) ) ( of carbon ) ) ( ( ( ( found ( in ( all ( organic matter ) ) ) ) , ) ( remaining ( in ( ancient material ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (NNP Carbon) (NNP dating)) (VP (VBZ measures) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN carbon) (CD 14)))))) (, ,) (NP (NP (DT a) (ADJP (RB slightly) (JJ radioactive)) (NN isotope)) (PP (IN of) (NP (NN carbon)))) (VP (VBD found) (PP (IN in) (NP (DT all) (JJ organic) (NN matter))) (, ,) (S (VP (VBG remaining) (PP (IN in) (NP (JJ ancient) (NN material)))))) (. .)))
Carbon dating measures the amount of carbon 14, a slightly radioactive isotope of carbon found in all organic matter, remaining in ancient material.
(ROOT (S (NP (NP (NNP Carbon) (CD 14) (NN isotope)) (PP (IN of) (NP (NN carbon)))) (VP (VBZ is) (ADVP (RB typically)) (VP (VBN used) (PP (TO to) (NP (NN date) (JJ ancient) (NNS items))))) (. .)))