About: http://webisa.webdatacommons.org/435053062

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	For images including the combination device, the x-ray energy used to capture an image was estimated by comparing the optical density of the aluminum device to that of the copper device.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com