( ( ( Both decay ) ( with ( ( the emission ) ( of ( penetrating ( gamma rays ) ) ) ) ) ) . )
(ROOT (NP (NP (DT Both) (NN decay)) (PP (IN with) (NP (NP (DT the) (NN emission)) (PP (IN of) (S (VP (VBG penetrating) (NP (NN gamma) (NNS rays))))))) (. .)))
Both decay with the emission of penetrating gamma rays.
(ROOT (S (PP (IN Of) (NP (NP (DT the) (CD three) (JJ basic) (NNS types)) (PP (IN of) (NP (JJ radioactive) (NNS emissions))))) (, ,) (NP (DT the) (NN gamma) (NN particle)) (VP (VBZ is) (NP (DT the) (JJS most) (NN penetrating))) (. .)))