( ( Of ( ( the ( three ( common types ) ) ) ( of ( radiation ( ( given off ) ( by ( radioactive ( materials ( , ( alpha ( , ( ( beta and ) gamma ) ) ) ) ) ) ) ) ) ) ) ) ( , ( beta ( ( has ( ( the medium ) ( penetrating ( ( power and ) ( the ( medium ( ionising power ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Of) (NP (NP (DT the) (CD three) (JJ common) (NNS types)) (PP (IN of) (NP (NP (NN radiation)) (VP (VBN given) (PRT (RP off)) (PP (IN by) (NP (JJ radioactive) (NNS materials) (, ,) (NN alpha) (, ,) (NN beta) (CC and) (NN gamma)))))))) (, ,) (NP (NN beta)) (VP (VBZ has) (NP (NP (DT the) (NN medium)) (VP (VBG penetrating) (NP (NP (NN power)) (CC and) (NP (DT the) (NN medium) (VBG ionising) (NN power)))))) (. .)))
Of the three common types of radiation given off by radioactive materials, alpha, beta and gamma, beta has the medium penetrating power and the medium ionising power.
(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))) (. .)))