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Chapter 42: Q 31 Exercise (page 1236)
What is the total energy (in MeV) released in the beta-minus
decay of 3H?
Hence, the energy released is
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Calculate the mass, radius, and density of the nucleus of .
Give all answers in SI units.
Beta-plus decay is
a. Determine the mass threshold for beta-plus decay. That is, what is the minimum atomic mass mX for which this decay is energetically possible? Your answer will be in terms of the atomic mass mY and the electron mass me.
b. Can 13 N undergo beta-plus decay into 13 C? If so, how much energy is released in the decay?
The three isotopes
Which of these isotopes would be most useful as a biological tracer? Why?We鈥檝e noted that fewer than of the known nuclei are stable (i.e., not radioactive). Because nuclei are characterized by two independent numbers, and , it is useful to show the known nuclei on a plot of neutron number versus proton number.
The element gallium has two stable isotopes: 69 Ga with an atomic mass of 68.92 u and 71 Ga with an atomic mass of 70.92 u. A periodic table shows that the chemical atomic mass of gallium is 69.72 u. What is the percent abundance of 69 Ga?
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