About: http://webisa.webdatacommons.org/411003430

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	Such a material is functionally like a secondary target in XRF. In the example where xenon is the vapor used in the tube, a material such as tin (Sn) may be used as a secondary target/shield.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es