"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. \"Sm\" means the element \"samarium\" and \"153Sm\" is the isotope \"samarium-153\" with a half-life of 1.94e+00 days."@en . "accepted"@en . "surface_radioactivity_content_of_153Sm"@en . "2018-02-12 16:53:18.0" . . "SDN:P07::504FSRM3" . . . "false" . "1" . "SDN:P07::504FSRM3" . . . "SDN:P07::504FSRM3" . "" .