"1" . "2018-02-12 16:53:18.0" . "" . "SDN:P07::6YCFS72W" . "accepted"@en . . "surface_radioactivity_content_of_212Bi"@en . . "1" . "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. \"Bi\" means the element \"bismuth\" and \"212Bi\" is the isotope \"bismuth-212\" with a half-life of 4.20e-02 days."@en . . "SDN:P07::6YCFS72W" . "false" . "SDN:P07::6YCFS72W" . . "2018-02-12 16:53:18.0" . . .