( Radioactivity ( ( ( can ( be ( measured ( using ( a geiger ) ) ) ) ) ( ( counter , ) ( ( a cylinder ) ( containing ( ( ( a ( low-pressure gas ) ) and ) ( ( two ( -LRB- ( 2 -RRB- ) ) ) electrodes ) ) ) ) ) ) . ) )
(ROOT (SINV (ADVP (RB Radioactivity)) (VP (MD can) (VP (VB be) (VP (VBN measured) (S (VP (VBG using) (NP (DT a) (NN geiger))))))) (NP (NP (NN counter)) (, ,) (NP (NP (DT a) (NN cylinder)) (VP (VBG containing) (NP (NP (DT a) (JJ low-pressure) (NN gas)) (CC and) (NP (NP (CD two)) (PRN (-LRB- -LRB-) (NP (CD 2)) (-RRB- -RRB-)) (NP (NNS electrodes))))))) (. .)))
Radioactivity can be measured using a geiger counter , a cylinder containing a low-pressure gas and two (2) electrodes .
(ROOT (S (NP (NP (DT The) (`` `) (NN counting) ('' ') (NN instrument)) (NP (NN geiger) (NN counter))) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN radioactivity))))))) (. .)))