( ( Gamma particles ) ( ( ( ( are ( ( the ( most penetrating ) ) ( of ( the ( decay products ) ) ) ) ) , ) ( being ( capable ( of ( ( penetrating ( ( a ( few centimeters ) ) ( of lead ) ) ) ( if ( they ( have ( enough energy ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Gamma) (NNS particles)) (VP (VBP are) (NP (NP (DT the) (JJS most) (NN penetrating)) (PP (IN of) (NP (DT the) (NN decay) (NNS products)))) (, ,) (S (VP (VBG being) (ADJP (JJ capable) (PP (IN of) (S (VP (VBG penetrating) (NP (NP (DT a) (JJ few) (NNS centimeters)) (PP (IN of) (NP (NN lead)))) (SBAR (IN if) (S (NP (PRP they)) (VP (VBP have) (NP (JJ enough) (NN energy)))))))))))) (. .)))
Gamma particles are the most penetrating of the decay products, being capable of penetrating a few centimeters of lead if they have enough energy.
(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))) (. .)))