"surface_radioactivity_content_of_129mXe"@en . "" . "2018-02-12 16:53:18.0" . "SDN:P07::41DS5UVP" . . "false" . . "accepted"@en . . . "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. \"Xe\" means the element \"xenon\" and \"129mXe\" is the metastable state of the isotope \"xenon-129\" with a half-life of 8.02e+00 days."@en . "1" . . "SDN:P07::41DS5UVP" . "1" . "SDN:P07::41DS5UVP" . .