  PbWO4 crystal scintillators are discussed as an active shield and
light-guides in 116Cd double beta decay experiment with CdWO4 scintillators.
Scintillation properties and radioactive contamination of PbWO4 scintillators
were investigated. Energy resolution of CdWO4 detector, coupled to PbWO4
crystal as a light-guide, was tested. Efficiency of PbWO4-based active shield
to suppress background from the internal contamination of PbWO4 crystals was
calculated. Using of lead tungstate crystal scintillators as high efficiency
4-pi active shield could allow to build sensitive double beta experiment with
116CdWO4 crystal scintillators.
