"SDN:P07::T0Z8MHLZ" . "" . "integral_wrt_time_of_radioactivity_concentration_of_109mAg_in_air"@en . "accepted"@en . "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. \"Ag\" means the element \"silver\" and \"109mAg\" is the metastable state of the isotope \"silver-109\" with a half-life of 4.58e-04 days."@en . . . . . .