"SDN:P07::3S7T5900" . . "SDN:P07::3S7T5900" . . "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. \"Cm\" means the element \"curium\" and \"243Cm\" is the isotope \"curium-243\" with a half-life of 1.17e+04 days."@en . "false" . "SDN:P07::3S7T5900" . "surface_radioactivity_content_of_243Cm"@en . "" . "accepted"@en . . "1" . "1" . . . "2018-02-12 16:53:18.0" . .