( ( methods ( of ( ( ( ( ( radiation detection ) , ) internal ) and ) ( external ( radiation dosimetry ) ) ) ) ) ; )
(ROOT (NP (NP (NNS methods)) (PP (IN of) (NP (NP (NN radiation) (NN detection)) (, ,) (NP (JJ internal)) (CC and) (NP (JJ external) (NN radiation) (NN dosimetry)))) (: ;)))
methods of radiation detection, internal and external radiation dosimetry;
(ROOT (S (NP (NNS Amphibians)) (ADVP (RB sexually)) (VP (VB reproduce) (PP (IN through) (NP (JJ external) (CC or) (JJ internal) (NN fertilization)))) (. .)))