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Chapter 38: Problem 21
A milk sample shows iodine- 131 activity of \(450 \mathrm{pCi} / \mathrm{L}\). What's its activity in Bq/L?
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Analysis of a Moon rock shows that \(82 \%\) of its initial \(\mathrm{K}-40\) has decayed to Ar-40, a process with a half-life of \(1.2 \times 10^{9}\) years. How old is the rock?
Why are there no stable nuclei for sufficiently high atomic numbers?
It's possible, though difficult, to realize alchemists' dreams of synthesizing gold. One reaction involves bombarding mercury198 with neutrons to produce, for each neutron captured, a gold-197 nucleus and another particle. Write the equation for this reaction.
Compare the radius of the proton (the \(A=1\) nucleus) with the Bohr radius of the hydrogen atom.
The table below lists reported levels of iodine- 131 contamination in milk in three countries affected by the 1986 Chernobyl accident, along with each country's safety guideline. Given I-131's half-life of 8.04 days, how long did each country have to wait for I-131 levels to decline to a level deemed safe by its standards? $$\begin{array}{lcc} \hline & \multicolumn{2}{c} {\text { Level }(\mathrm{B} q / \mathrm{L})} \\ \hline \text { Country } & \text { Reported } & \text { Safety Guideline } \\ \hline \text { Poland } & 2000 & 1000 \\ \text { Austria } & 1500 & 370 \\ \text { Germany } & 1184 & 500 \\ \hline \end{array}$$
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