"SDN:P07::9DJWC2S1" . "surface_radioactivity_content_of_156Sm"@en . "SDN:P07::9DJWC2S1" . "2018-02-12 16:53:18.0" . "false" . . . . "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. \"Sm\" means the element \"samarium\" and \"156Sm\" is the isotope \"samarium-156\" with a half-life of 3.91e-01 days."@en . "accepted"@en . "1" . . "1" . . . "SDN:P07::9DJWC2S1" .