About: http://webisa.webdatacommons.org/154154353

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Preferably, the source shield and the sides are formed from a high density, high atomic number material, such as lead, tungsten, depleted uranium, or combinations thereof.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk