"SDN:P07::874Y3LT7" . "surface_radioactivity_content_of_72Zn"@en . . "2018-02-12 16:53:18.0" . . "" . "1" . "accepted"@en . "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. \"Zn\" means the element \"zinc\" and \"72Zn\" is the isotope \"zinc-72\" with a half-life of 1.94e+00 days."@en . "false" . "SDN:P07::874Y3LT7" . "SDN:P07::874Y3LT7" . . . . "2018-02-12 16:53:18.0" . . "1" .