"surface_radioactivity_content_of_41Ar"@en . . "SDN:P07::96Q65MFL" . . . "" . "false" . "1" . "SDN:P07::96Q65MFL" . "The surface called \"surface\" means the lower boundary of the atmosphere. \"Content\" indicates a quantity per unit area. \"Radioactivity\" means the number of radioactive decays of a material per second. \"Ar\" means the element \"argon\" and \"41Ar\" is the isotope \"argon-41\" with a half-life of 7.64e-02 days."@en . "2018-02-12 16:53:18.0" . "accepted"@en . . "1" . "SDN:P07::96Q65MFL" . . "2018-02-12 16:53:18.0" . .