"integral_wrt_time_of_radioactivity_concentration_of_134Cs_in_air"@en . . "SDN:P07::ZFC3IB5W" . "The phrase \"integral_wrt_X_of_Y\" means int Y dX. The data variable should have an axis for X specifying the limits of the integral as bounds. The phrase \"wrt\" means \"with respect to\". \"Radioactivity\" means the number of radioactive decays of a material per second. \"Radioactivity concentration\" means radioactivity per unit volume of the medium. \"Cs\" means the element \"cesium\" and \"134Cs\" is the isotope \"cesium-134\" with a half-life of 7.50e+02 days."@en . .