( ( Both ( ( ( alpha and ) beta ) particles ) ) ( ( are ( emitted ( from ( unstable isotopes ) ) ) ) . ) )
(ROOT (S (NP (DT Both) (ADJP (NN alpha) (CC and) (NN beta)) (NNS particles)) (VP (VBP are) (VP (VBN emitted) (PP (IN from) (NP (JJ unstable) (NNS isotopes))))) (. .)))
Both alpha and beta particles are emitted from unstable isotopes.
(ROOT (S (NP (NN Beta) (NN decay)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT an) (JJ unstable) (NN nucleus)) (VP (VBZ emits) (NP (NP (DT a) (JJ beta) (NN particle)) (CC and) (NP (NN energy))))))) (. .)))