For each quantity in the table below, write the symbol of the SI unit in which it would usually be measured.
\begin{tabular}{|c|c|}
\hline quantity & unit symbol \\
\hline \begin{tabular}{l}
The amount of radiation damage a steel nuclear power plant containment vesse \\
sustains over its 50 -year operating lifetime.
\end{tabular} & \\
\hline The legal limit of daily radiation exposure for dental X-ray technicians. & \\
\hline The intensity of nuclear radiation emitted by a gram of iodine- 131 . & \\
\hline \begin{tabular}{l}
The total dose of gamma radiation typically used to treat prostate cancers of a \\
certain stage.
\end{tabular} & \\
\hline
\end{tabular}