- 2 Many Patients Get Concerned When A Test Involves Injection Of A Radioactive Material For Example For Scanning A Gall 1 (67.29 KiB) Viewed 112 times
2. Many patients get concerned when a test involves injection of a radioactive material. For example for scanning a gallbladder, a few drops of Technetium-99m isotope is used. Half of the techritium-99m would be gone in about 6 hours. It, however, takes about 24 hours for the radiation levels to reach what we are exposed to in day-to-day activities. Below is given the relative intensity of radiation as a function of time. t (hrs) Y Relative intensity of radiation as afunction of time 0 1 3 5 7 1.000 0.891 0.708 0.562 0.447 9 0.355 If the level of the relative intensity of radiation is related to time via an exponential formula, y = Aert Find; a) the value of the regression constants A and 2 b) time, t (hrs) for the half-life (@y= 0.5 ) of Technium-99m, and c) the radiation intensity after 24 hours.