Patent ID: 7788967

Claim:
A method for detecting the permeable integrity of a container having a plurality of walls comprising the steps of: providing a container having a plurality of chambers with at least a second chamber substantially surrounding a first chamber, each chamber having chamber walls thus creating an interstitial space between the walls of the first and second chambers; providing a tracer source in communication with a first or second chamber; providing a filling and evacuation system to actively provide and remove tracer, said system in communication with a region selected from the group consisting of: an interstitial space between said first and second chambers, and the first chamber; subjecting at least the second chamber to repeated pressure changes during filling and evacuation cycles via the filling and evacuation system; sampling the fluid from a region selected from the group consisting of: an interstitial space between said first and second chambers, and the first chamber; and evaluating the fluid for the presence of tracer evidencing a leak in a wall from a region selected from the group consisting of: an interstitial space between said first and second chambers, and the first chamber.