( ( ( Exposure ( to ( ( beryllium and ) radiation ) ) ) ( are ( required ( to ( be ( kept ( ( as low ) ( as ( ( ( ( modern technology ) and ) ( common sense ) ) ( will allow ) ) ) ) ) ) ) ) ) ) ( , ( he ( said . ) ) ) )
(ROOT (S (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (NN beryllium) (CC and) (NN radiation)))) (VP (VBP are) (VP (VBN required) (S (VP (TO to) (VP (VB be) (VP (VBN kept) (ADVP (ADVP (RB as) (JJ low)) (SBAR (IN as) (S (NP (NP (JJ modern) (NN technology)) (CC and) (NP (JJ common) (NN sense))) (VP (MD will) (VP (VB allow))))))))))))) (, ,) (NP (PRP he)) (VP (VBD said)) (. .)))
Exposure to beryllium and radiation are required to be kept as low as modern technology and common sense will allow, he said.
(ROOT (S (NP (NP (DT The) (JJ low) (JJ atomic) (NN number)) (PP (IN of) (NP (NN beryllium)))) (VP (VBZ allows) (S (NP (PRP it)) (VP (TO to) (VP (VB absorb) (NP (NNPS x-rays)))))) (. .)))