<http://webisa.webdatacommons.org/59900724>	<http://www.w3.org/ns/prov#value>	"Thus, substances such as lead, concrete, and steel are very practical shielding materials because of the abundance of atoms and electrons that can interact with the photon." .
<http://webisa.webdatacommons.org/prov/165749418>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/59900724> .
<http://webisa.webdatacommons.org/59900724>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/59900724>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<radford.edu> .
<http://webisa.webdatacommons.org/prov/290607525>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/59900724> .