. "2018-02-12 16:53:18.0" . "SDN:P07::6RZFEE06" . . "SDN:P07::6RZFEE06" . "1" . . . "2018-02-12 16:53:18.0" . . "SDN:P07::6RZFEE06" . "radioactivity_concentration_of_97Nb_in_air"@en . "" . "false" . . "1" . "\"Radioactivity\" means the number of radioactive decays of a material per second. \"Radioactivity concentration\" means radioactivity per unit volume of the medium. \"Nb\" means the element \"niobium\" and \"97Nb\" is the isotope \"niobium-97\" with a half-life of 5.11e-02 days."@en . "accepted"@en .