\begin{tabular}{|c|c|c|c|c|c|c|} \hline Isotope & #neutrons & #protons & #electrons & BindingEnergy(MeV) & PreferredDecayProcess(,,+,n)andhalf-life & UseorApplication? \\ \hline18F1 & & & & MarkerforPETscans \\ \hline135Xe & & & & & Commonfissionproduct \\ \hline222Rn & & & & Environmentalhazard(basments) \\ \hline241Am & & & & & \\ \hline \end{tabular}