( PIGME ( Particle-Induced ( GaMma ( ion ( Emission . ) ) ) ) )
(ROOT (NP (NNP PIGME) (NNP Particle-Induced) (NNP GaMma) (NNP ion) (NNP Emission) (. .)))
PIGME Particle-Induced GaMma ion Emission.
(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))) (. .)))