Nuclear Pumped Laser Missiles

The nuclear warhead pumped laser was first proposed by the high
frontiers foundation for use in the SDI system.
  They are well described in the Novel "FootFall" by Larry Niven and are
called "SpurtBombs" that focus Gamma Radiation from a Nuclear Reaction
towards a target.  The description that the 1d6 demonstrates how many of
the beams actually hit their target is an apt one, except that it is
2d6.
Phil P.