"accepted"@en . "2018-02-12 16:53:18.0" . . "1" . . "surface_radioactivity_content_of_242Am"@en . "SDN:P07::8DR10NYJ" . "2018-02-12 16:53:18.0" . . . "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. \"Am\" means the element \"americium\" and \"242Am\" is the isotope \"americium-242\" with a half-life of 6.69e-01 days."@en . "SDN:P07::8DR10NYJ" . "" . "false" . "1" . . . "SDN:P07::8DR10NYJ" .