. "1" . "radioactivity_concentration_of_93Zr_in_air"@en . "" . "accepted"@en . "false" . . . "SDN:P07::2DHX2I5G" . . "2018-02-12 16:53:18.0" . "SDN:P07::2DHX2I5G" . "SDN:P07::2DHX2I5G" . "1" . . . "\"Radioactivity\" means the number of radioactive decays of a material per second. \"Radioactivity concentration\" means radioactivity per unit volume of the medium. \"Zr\" means the element \"zirconium\" and \"93Zr\" is the isotope \"zirconium-93\" with a half-life of 3.47e+08 days."@en . "2018-02-12 16:53:18.0" .