  We evaluate background rejection capabilities and physics performance of a
detector composed of two diverse elements: a sensitive target (filled with one
or two species of liquefied noble gasses) and an active veto (made of Gd-doped
ultra-pure water). A GEANT4 simulation shows that for a direct WIMP search,
this device can reduce the neutron background to O(1) event per year per tonne
of material. Our calculation shows that an exposure of one tonne $\times$ year
will suffice to exclude spin-independent WIMP-nucleon cross sections ranging
from $10^{-9}$ pb to $10^{-10}$ pb.
