About: http://webisa.webdatacommons.org/196201643

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	The sun and stars contribute to our background radiation, as do radioactive materials such as uranium, tritium and radon found in the earth???s soil, water and air.
http://www.w3.org/ns/prov#wasQuotedFrom	ucdavis.edu