( ( Using ( ( radiometry , ) ( which ( is ( similar ( to ( counting ( ( the ticks ) ( ( given off ) ( by ( a ( Geiger counter ) ) ) ) ) ) ) ) ) ) ) ) ( , ( ( ( the amount ) ( of ( ( beta ( particle ( ( -LRB- ( electron -RRB- ) ) decays ) ) ) ( per ( 1000 minutes ) ) ) ) ) ( ( is measured ) . ) ) ) )
(ROOT (S (S (VP (VBG Using) (NP (NP (NN radiometry)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ similar) (PP (TO to) (S (VP (VBG counting) (NP (NP (DT the) (NNS ticks)) (VP (VBN given) (PRT (RP off)) (PP (IN by) (NP (DT a) (NNP Geiger) (NN counter))))))))))))))) (, ,) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (JJ beta) (NN particle) (PRN (-LRB- -LRB-) (NP (NN electron)) (-RRB- -RRB-)) (NNS decays)) (PP (IN per) (NP (CD 1000) (NNS minutes)))))) (VP (VBZ is) (VP (VBN measured))) (. .)))
Using radiometry, which is similar to counting the ticks given off by a Geiger counter, the amount of beta particle (electron) decays per 1000 minutes is measured.
(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))))))) (. .)))