. . "2018-02-12 16:53:18.0" . . . "1" . "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. \"Se\" means the element \"selenium\" and \"83mSe\" is the metastable state of the isotope \"selenium-83\" with a half-life of 8.10e-04 days."@en . "2018-02-12 16:53:18.0" . . "SDN:P07::3H3VKAS4" . "SDN:P07::3H3VKAS4" . . "accepted"@en . "" . "surface_radioactivity_content_of_83mSe"@en . "false" . "1" . "SDN:P07::3H3VKAS4" .