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Chapter 38: Problem 25
A milk sample shows iodine- 131 activity of \(450 \mathrm{pCi} / \mathrm{L}\). What's its activity in Bq/L?
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Carbon- 11 -labeled acetate shows promise in \(\mathrm{PET}\) scans for determining the extent of metastasized prostate cancer. (a) Given C-11's 20.4-min half-life, how long will it take an initial dose of \(2.0 \mathrm{GBq}\) to decay to \(7.0 \mathrm{kBq}\) (roughly the natural radioactivity of the human body)? (b) What nucleus remains after \(C\) -1 1 decays by positron emission?
Three radon isotopes have \(125,134,\) and 136 neutrons. Write the symbol for each.
The proton-proton cycle consumes four protons while producing 27 MeV of energy. (a) At what rate must the Sun consume protons to produce its power output of \(4 \times 10^{26} \mathrm{W?}\) (b) The present phase of the Sun's life will end when it has consumed about \(10 \%\) of its original protons. Estimate how long this phase will last, assuming the Sun's \(2 \times 10^{30}-\mathrm{kg}\) mass was initially \(71 \%\) hydrogen.
How do (a) the number of nucleons and (b) the nuclear charge compare in the two nuclei \(\frac{35}{17} \mathrm{Cl}\) and \(\frac{35}{19} \mathrm{K} ?\)
Write a complete equation for neutron-induced fission of plutonium-239 that yields barium-143, two neutrons, and another nucleus.
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