orodeoxyglucose is a derivative of glucose that contains the radionuclide fluorine 18 A patient is given a sample of this material containing 245 MbQ of fluorine 18 a megabecquerel is a unit of radioactivity The patient then undergoes a PET scan to detect areas of metabolic activity indicative of cancer After 138 minutes one third of the original dose remains in the body Use a function of the form Q t Qoe kt to model the radioactivity level of fluorine at a time t minutes after the initial dose Give the value of k to three decimal places Do not round intermediate calculations Your Answer