Arrt Nuclear Medicine Boards (Math And Stats) Questions And Answers 100% Verified A+ Guaranteed

A source of I 131 ( t 1/2 = 8.05d) is delivered to the nuclear medicine department calibrated for 100 mCi at 8:00 AM on Monday. If this radioactivity is injected into a patient at noon on Tuesday, what radioactivity will the patient receive? A. 80 mCi B. 85 mCi C. 90 mCi D. 95 mCi {Ans: C. 90 mCi Solving the differential equation yields the radioactive decay law: A = A0e -t where A = activity at time t, A0 = activity at starting time, = decay constant, t = time since starting time. The decay constant is the fraction of atoms that decay per (small) time interval, and has units of 1 over time (e.g., 1/hr) or inverse time (hr-1 ). The typical radioactive decay calculation required in nuclear medicine specifies three of the four variables (A, A0, , t) in the decay equation, requiring that the fourth unknown variable be solved for.}A new gamma camera/computer system that uses a new method of calculating cardiac ejection fraction (EF) is installed in a nuclear medicine department. The department decides to calculate EF for the next 25 patients on both the old gamma camera and the new gamma camera