( ( Radon ( contamination 222Rn ) ) ( ( emits ( ( ( ( ( alpha and ) beta ) particles ) , ) ( ( the latter ) ( with ( ( a ( decay energy ) ) ( of ( 5.587 meV ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Radon) (NN contamination) (NNS 222Rn)) (VP (VBZ emits) (NP (NP (ADJP (NN alpha) (CC and) (NN beta)) (NNS particles)) (, ,) (NP (NP (DT the) (NN latter)) (PP (IN with) (NP (NP (DT a) (NN decay) (NN energy)) (PP (IN of) (NP (CD 5.587) (NN meV)))))))) (. .)))
Radon contamination 222Rn emits alpha and beta particles, the latter with a decay energy of 5.587 meV.
(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))))))) (. .)))