he radioactive isotope strontium-81 is used in medical imaging as indicated on the table above. If 40.7 milligrams of strontium-81 is dministered to a patient, how many milligrams are left in the body after 88.8 minutes? mg

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Some Radioactive Isotopes Useful in Medical Imaging
Mode of
Isotope
Decay
Half-life
Use in Medical Imaging
B+, Y
B+, Y
Carbon-11
20.3 m
Brain scan to trace glucose metabolism
Brain scan to trace glucose metabolism
Detect eye tumors
Diagnose albinism, image the spleen and gastrointestinal tract
Bone marrow function, diagnose anemias
Whole-body scan for tumors
Pancreas scan
F
Fluorine-18
109 m
14.3 d
Phosphorus-32
Chromium-51
Iron-59
Gallium-67
Selenium-75
Krypton-81m
Strontium-81
E.C., Y
B, Y
E.C., Y
E.C., Y
Cr
Fe
SGa
27.7 d
44.5 d
78.3 h
118 d
13.3 s
Lung ventilation scan
Scan for bone diseases, including cancer
Brain, liver, kidney, bone scans; diagnosis of damaged heart muscle
Diagnosis of thyroid malfunction
Kidney scan
Heart scan and exercise stress test
Sr
22.2 m
38
99m Te
43
Technetium-99m
6.01 h
Iodine-131
В, у
E.C., Y
E.C., Y
8.04 d
Mercury-197
Thallium-201
64.1 h
3.05 d
Transcribed Image Text:Some Radioactive Isotopes Useful in Medical Imaging Mode of Isotope Decay Half-life Use in Medical Imaging B+, Y B+, Y Carbon-11 20.3 m Brain scan to trace glucose metabolism Brain scan to trace glucose metabolism Detect eye tumors Diagnose albinism, image the spleen and gastrointestinal tract Bone marrow function, diagnose anemias Whole-body scan for tumors Pancreas scan F Fluorine-18 109 m 14.3 d Phosphorus-32 Chromium-51 Iron-59 Gallium-67 Selenium-75 Krypton-81m Strontium-81 E.C., Y B, Y E.C., Y E.C., Y Cr Fe SGa 27.7 d 44.5 d 78.3 h 118 d 13.3 s Lung ventilation scan Scan for bone diseases, including cancer Brain, liver, kidney, bone scans; diagnosis of damaged heart muscle Diagnosis of thyroid malfunction Kidney scan Heart scan and exercise stress test Sr 22.2 m 38 99m Te 43 Technetium-99m 6.01 h Iodine-131 В, у E.C., Y E.C., Y 8.04 d Mercury-197 Thallium-201 64.1 h 3.05 d
The radioactive isotope strontium-81 is used in medical imaging as indicated on the table above. If 40.7 milligrams of strontium-81 is
administered to a patient, how many milligrams are left in the body after 88.8 minutes?
mg
Transcribed Image Text:The radioactive isotope strontium-81 is used in medical imaging as indicated on the table above. If 40.7 milligrams of strontium-81 is administered to a patient, how many milligrams are left in the body after 88.8 minutes? mg
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