[1]For more information about these devices, see _Accelerators_, a
companion booklet in this Understanding the Atom series.
[2]For more information, see _Synthetic Transuranium Elements_, another
booklet in this series.
[3]The designation ²³⁵U is a new format, now in international usage, for
the more familiar style, U²³⁵, to designate isotopes.
[4]For more about plutonium, see _Plutonium_, a companion booklet in
this series.
[5]For more information on reactors, see _Nuclear Reactors_, another
booklet in this series.