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Chapter 38: Problem 26
Find the nuclear mass of plutonium-239, given its atomic mass of 239.052157 u.
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Nitrogen- 13 is a 10 -min-half-life isotope used to "tag" ammonia for PET scans, including quantification of myocardial infarction. Consider an intravenous injection incorporating \(20 \mathrm{mCi}\) of \(\mathrm{N}-13\) Plot a graph of \(\mathrm{N}-13\) activity versus time, with your vertical axis logarithmic and your horizontal axis linear. Why is the graph a straight line? What's the significance of its slope?
You measure the activity of a radioactive sample at \(2.4 \mathrm{MBq}\). Thirty minutes later, the activity level is 1.9 MBq. Find the material's half-life.
Why are fission fragments necessarily radioactive?
A family member is about to have a brain scan using technetium\(99^{*},\) an excited isotope with 6.01 -hour half-life. The hospital makes Tc-99* from the decay of molybdenum-99 \(\left(t_{1 / 2}=2.7 \text { days }\right)\) then delivers it to the nuclear medicine department. You're told that the \(\mathrm{Tc}-99^{*}\) will arrive 90 minutes after production, and that there must be 10 mg of it. The technician says she will produce \(12 \mathrm{mg}\) of \(\mathrm{Tc}-99^{* *} .\) Is that sufficient?
Why are there no stable nuclei for sufficiently high atomic numbers?
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