Use the References to access important values if needed for this question. Some
ID: 693224 • Letter: U
Question
Use the References to access important values if needed for this question. Some Radioactive Isotopes Useful in Medical Imaging Mode of Decay Hf-life Use in Medical Imaging Isotope IC Carbon-11 Fluorine-18 20.3 m rain scan to trace glucose metabolism 109 m 14.3 d 27.7 d 44.5 d Brain sean to trace glucose metabolism Detect eye tumors Diagnose albinism, image the spleen and gastrointestinal tract Bone marrow function, diagnose anemias Cr Chromium-51 a Gallium-67 "Yakr Krypton-81m E.C., Fe Iron-59 E.C., E.C., 78.3 h Whole-body scan for tumors 118 d 13.3 s 22.2 m 6.01 h 8.04 641 h Selenium-75 Pancreas scan Lung ventilation scan Scan for bone diseases, including cancer Brain, liver, kidney, bone scans; diagnosis of damaged heart muscle Diagnoeis of thyroid malfunction Kidney scan Heart scan and exercise stress test Strontium-81 Sr 96 Te Technetium-99m Iodine-131 1 Hg Mercury-197 TThallium-201 d E.C.3.05 d C., E.C..Y The radioactive isotope thallium-201 is used in medical imaging as indicated on the table above. If 75.3 milligrams of thallium-201 is administered to a patient, how many milligrams are left in the body after 6.10 days? Submit Answer Retry Entire Group 9 more group attempts remaining Previous NextExplanation / Answer
Half Life of Thallium -201 is 3.05d, initial amount was 75.3 mg
Time spent = 6.10 days
Number of half lives = 6.10/3.05 = 2
Therefore, the amount left after n half lives = (1/2n)x initial amount.
Hence , the amount left after 6.10 days (2 half lives) = 75.3/4 mg = 18.825 mg
The required answer is 18.825 mg
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