System and method for improving the detection performance of a wirelessly transmitted signal. When the radon level in the working liquid reaches a certain level, the working liquid is either taken out of service and stored until the radon level is reduced or the working liquid is diluted with additional working liquid having no radon. This wall defines an upper edge contained within a second plane that is inclined relative to and meeting the first plane substantially along a second portion of the periphery. In an illustrative aspect of the invention, a system for managing IT resources in terms of business financials comprises an electronic contract authoring system or \u201cecAuthoring system,\u201d an electronic contract manager module or \u201cecManager,\u201d and one or more electronic contract agent modules or \u201cecAgents\u201d that may run on IT elements that are being managed.