( ( ( The smaller ) ( ( the chance ) ( of decay ) ) ) ( , ( ( the longer ) ( ( ( ( the half-life ) ( -LRB- ( ( ( time ( for half ) ) ( of ( ( the sample ) ( to decay ) ) ) ) -RRB- ) ) ) ( of ( the ( particular ( radioactive isotope ) ) ) ) ) . ) ) ) )
(ROOT (X (X (X (DT The) (ADJP (JJR smaller))) (NP (NP (DT the) (NN chance)) (PP (IN of) (NP (NN decay))))) (, ,) (X (DT the) (JJR longer)) (NP (NP (NP (DT the) (NN half-life)) (PRN (-LRB- -LRB-) (NP (NP (NN time)) (PP (IN for) (NP (NN half))) (PP (IN of) (NP (NP (DT the) (NN sample)) (PP (TO to) (NP (NN decay)))))) (-RRB- -RRB-))) (PP (IN of) (NP (DT the) (JJ particular) (NN radioactive) (NN isotope)))) (. .)))
The smaller the chance of decay, the longer the half-life (time for half of the sample to decay) of the particular radioactive isotope.
(ROOT (S (NP (DT The) (NN term) (NN half-life)) (VP (VBZ decribes) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN time)) (VP (VBN required) (PP (IN for) (NP (NP (NN half)) (PP (IN of) (NP (DT the) (JJ original) (NN material))))) (PP (TO to) (NP (NP (NN decay)) (PP (IN in) (NP (DT an) (NN isotope)))))))))) (. .)))