"2018-02-12 16:53:18.0" . . "1" . "1" . "accepted"@en . "\"Radioactivity\" means the number of radioactive decays of a material per second. \"Radioactivity concentration\" means radioactivity per unit volume of the medium. \"Pr\" means the element \"praseodymium\" and \"142Pr\" is the isotope \"praseodymium-142\" with a half-life of 7.94e-01 days."@en . "radioactivity_concentration_of_142Pr_in_air"@en . . "SDN:P07::7VYRN0BJ" . . . "false" . . "SDN:P07::7VYRN0BJ" . . "2018-02-12 16:53:18.0" . "" . "SDN:P07::7VYRN0BJ" .