. . . "2018-02-12 16:53:18.0" . "false" . "surface_radioactivity_content_of_151Pm"@en . . "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. \"Pm\" means the element \"promethium\" and \"151Pm\" is the isotope \"promethium-151\" with a half-life of 1.18e+00 days."@en . "SDN:P07::1IY2MG8V" . "" . "accepted"@en . "1" . "1" . . "2018-02-12 16:53:18.0" . "SDN:P07::1IY2MG8V" . . "SDN:P07::1IY2MG8V" .