About: http://webisa.webdatacommons.org/193130145

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	This could be either the fissile material itself or heavy metals such as lead, tungsten or bismuth, used to shield gamma rays from detection by the passive methods described above.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr