"integral_wrt_time_of_radioactivity_concentration_of_106Ru_in_air"@en . . "SDN:P07::QB2VBNOJ" . "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. \"Ru\" means the element \"ruthenium\" and \"106Ru\" is the isotope \"ruthenium-106\" with a half-life of 3.66e+02 days."@en . .