You might consider performing an RF survey before investing in shielding.
Most of the newer CRTs do not radiate hazardous RF levels.
Tad Blanchard NASA-Goddard Space Flight Center
Sr Health Physics Tech Code 205.9, Greenbelt, MD 20771
Parallax, Inc Phone: 301-286-9157
A Member of the OHI Team Fax: 301-286-1618
mailto:tmblanch@pop200.gsfc.nasa.gov
http://gsfc-aphrodite.gsfc.nasa.gov/205/205-2/Health/RADPROT.HTM
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html