( ( ( He and ) Soddy ) ( ( ( ( ( published ( their findings ) ) ( ( ( on ( ( the properties ) ( of ( ( ( alpha and ) beta ) particles ) ) ) ) and ) ( on ( gamma-ray emission ) ) ) ) ( during ( radioactive decay ) ) ) ( -LRB- ( ( see Radioactivity ) -RRB- ) ) ) . ) )
(ROOT (S (NP (PRP He) (CC and) (NNP Soddy)) (VP (VBD published) (NP (PRP$ their) (NNS findings)) (PP (PP (IN on) (NP (NP (DT the) (NNS properties)) (PP (IN of) (NP (ADJP (NN alpha) (CC and) (NN beta)) (NNS particles))))) (CC and) (PP (IN on) (NP (JJ gamma-ray) (NN emission)))) (PP (IN during) (NP (JJ radioactive) (NN decay))) (PRN (-LRB- -LRB-) (S (VP (VB see) (NP (NNP Radioactivity)))) (-RRB- -RRB-))) (. .)))
He and Soddy published their findings on the properties of alpha and beta particles and on gamma-ray emission during radioactive decay ( see Radioactivity ).
(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))) (. .)))