"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. \"Pd\" means the element \"palladium\" and \"109Pd\" is the isotope \"palladium-109\" with a half-life of 5.61e-01 days."@en . "" . "SDN:P07::52IUWBLO" . "2018-02-12 16:53:18.0" . . . . . "surface_radioactivity_content_of_109Pd"@en . "accepted"@en . "2018-02-12 16:53:18.0" . "SDN:P07::52IUWBLO" . . . "false" . "1" . "SDN:P07::52IUWBLO" . "1" .