( ( ( ( ( ( ( Gamma radiation ) ( can ( ( penetrate ( very far ) ) ( into ( a material ) ) ) ) ) , ) and ) so ) ( it ( is ( ( gamma radiation ) ( that ( ( ( ( poses ( the ( most danger ) ) ) ( when ( working ( with ( radioactive materials ) ) ) ) ) , ) ( although ( ( ( all types ) ( of radiation ) ) ( are ( very dangerous ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Gamma) (NN radiation)) (VP (MD can) (VP (VB penetrate) (ADVP (RB very) (RB far)) (PP (IN into) (NP (DT a) (NN material)))))) (, ,) (CC and) (IN so) (S (NP (PRP it)) (VP (VBZ is) (NP (NP (NN gamma) (NN radiation)) (SBAR (WHNP (WDT that)) (S (VP (VBZ poses) (NP (DT the) (JJS most) (NN danger)) (SBAR (WHADVP (WRB when)) (S (VP (VBG working) (PP (IN with) (NP (JJ radioactive) (NNS materials)))))) (, ,) (SBAR (IN although) (S (NP (NP (DT all) (NNS types)) (PP (IN of) (NP (NN radiation)))) (VP (VBP are) (ADJP (RB very) (JJ dangerous))))))))))) (. .)))
Gamma radiation can penetrate very far into a material, and so it is gamma radiation that poses the most danger when working with radioactive materials, although all types of radiation are very dangerous.
(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))) (. .)))