"SDN:P07::77HZPQ9W" . . "" . . "accepted"@en . "2018-02-12 16:53:18.0" . "false" . . "SDN:P07::77HZPQ9W" . "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 \"83Se\" is the isotope \"selenium-83\" with a half-life of 1.56e-02 days."@en . . "surface_radioactivity_content_of_83Se"@en . "2018-02-12 16:53:18.0" . . . "SDN:P07::77HZPQ9W" . "1" . "1" .