(1) The radioactive isotope fluorine-18 is used in medical imaging as indicated

Question

(1) The radioactive isotope fluorine-18 is used in medical imaging as indicated on the table above. How many protons and neutrons are there in a fluorine-18 atom?

_____protons
_____neutrons

(2) When the nuclide fluorine-18 decays as indicated on the table:

the number of protons in the product nuclide is: ______

the number of neutrons in the product nuclide is: _______

the name of the product nuclide is: ________

Some Radioactive Isotopes Useful in Medical Imaging Mode of Decay Isotope Half-life Use in Medical Imaging iC SF Carbon-11 Fluorine-18 Phosphorus-32 Chromium-51 Iron-59 Gallium-67 Selenium-75 20.3 m 109 m 14.3 d 27.7 d 44.5 d 78.3 h 118 d 13.3 s 22.2 m 6.01 h 8.04 d 64.1 h 3.05 d 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 Lung ventilation scan Scan for bone diseases, including cancer Brain, liver, kidney, bone scans; diagnosis of damaged heart muscle E.C., Ga 75 E.C., E.C., saKr Krypton-81m Strontium-81 Technetium-99m Iodine-131 99m 43 iagnosis of thyroid malfunction Kidney scan Heart scan and exercise stress test g Mercury-19'7 E.C., E.C., Thallium-201

Explanation / Answer

1) 9F18       protons = 9 ( same as atomic number)

             Neutrons = mass number - atomic number = 18 -9 = 9.

2)      9F18 decays to 8F18 after beta plus decay and in Gamma decay only energy transfered from one state to the other but there is no effect on nucleus.

number of protons in product nuclide = 8

number of neutons in product nuclide = 10

Name of the product nuclide = 8F18

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