"1" . "false" . "2018-02-12 16:53:18.0" . . . . "SDN:P07::14K31TG7" . "" . . "accepted"@en . "radioactivity_concentration_of_91mY_in_air"@en . "2018-02-12 16:53:18.0" . "\"Radioactivity\" means the number of radioactive decays of a material per second. \"Radioactivity concentration\" means radioactivity per unit volume of the medium. \"Y\" means the element \"yttrium\" and \"91mY\" is the metastable state of the isotope \"yttrium-91\" with a half-life of 3.46e-02 days."@en . "1" . . "SDN:P07::14K31TG7" . . "SDN:P07::14K31TG7" .