( otherwise ( it ( ( d ( be ( ( ( ( a ( different ( element ( -RRB- ( Radioactive isotope ) ) ) ) ) ( -LRB- ( radioisotope -RRB- ) ) ) -- ) ( isotope ( that ( spontaneously ( ( ( decays ( to ( form ( a ( different isotope ) ) ) ) ) , ) ( ( giving off ) ( radiation ( in ( the process ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB otherwise)) (NP (PRP it)) (VP (MD d) (VP (VB be) (NP (NP (DT a) (JJ different) (NN element) (-RRB- -RRB-) (JJ Radioactive) (NN isotope)) (PRN (-LRB- -LRB-) (NP (NN radioisotope)) (-RRB- -RRB-)) (: --) (NP (NP (NN isotope)) (SBAR (WHNP (WDT that)) (S (ADVP (RB spontaneously)) (VP (VBZ decays) (S (VP (TO to) (VP (VB form) (NP (DT a) (JJ different) (NN isotope))))) (, ,) (S (VP (VBG giving) (PRT (RP off)) (NP (NP (NN radiation)) (PP (IN in) (NP (DT the) (NN process))))))))))))) (. .)))
otherwise it d be a different element) Radioactive isotope (radioisotope) -- isotope that spontaneously decays to form a different isotope, giving off radiation in the process.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NNS radioisotopes)) (VP (VBZ is) (NP (NP (DT an) (NN isotope)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADJP (JJ radioactive))))))) (. .)))