"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 \"134mXe\" is the metastable state of the isotope \"xenon-134\" with a half-life of 3.36e-06 days."@en . "SDN:P07::2S0BBV0F" . "" . "accepted"@en . "1" . "false" . . "2018-02-12 16:53:18.0" . "surface_radioactivity_content_of_134mXe"@en . . . . "SDN:P07::2S0BBV0F" . . "SDN:P07::2S0BBV0F" . . "2018-02-12 16:53:18.0" . "1" .