H-3 Signs

["Walker, Bob" <Bob.Walker@rcp.dph.state.ma.us>]

Tritium-powered signage has been around for decades, and the CAN-AC series
of model numbers mentioned by the originator of this thread has been in use
for many years.  Manufacturing of tritium light sources was established in
Canada only about 14 or 15 years ago, and the CAN-AC series of models
predates that.  One of the US manufacturers who has been around long enough
to have possibly been responsible for the CAN-AC line is:

Self-Powered Lighting
169 Western Highway 
W.Nyack, NY 10994 
Phone:(914)353-0235 

Another is the US affiliate of the Canadian manufacturer Shield Source Inc.,
whose phone number in Canada was given by another writer.

By the way, 21 curies of tritium in an exit sign is not unusual.  

Bob Walker
Radiation Control Officer
Massachusetts Department of Public Health
Radiation Control Program
Boston, MA



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