[ RadSafe ] What is the typical warranty or life expectancy of a leaded enclosure?

[Ted de Castro]

This question has been put to me from a client who sells x-ray analysis 
equipment in a large (not walk-in) leaded enclosure/cabinet and has been 
concerned with how long they should warranty the radiation protection 
integrity of their enclosure.

In any environment I've ever worked in I've never seen any indication of 
a warranty on the integrity of the lead lined enclosure - they just seem 
to last forever and that's what everyone just seems to expect.

Does anyone have any more rational input on this issue?

Thank-you