Finding an appropriate instrument to leak test very low levels of Americium, such as in old smoke detectors, poses significant challenges. The discussion highlights that measuring alpha emissions is critical, as the radiation from Americium primarily consists of alpha particles, which are easily stopped by air and other materials. While options like HpGe detectors and handheld gamma counters are mentioned, they may not be effective for such low levels of detection, with costs for accurate testing potentially exceeding the value of replacing the smoke detector. Wipe tests are suggested as a method to check for leakage, but the interpretation of results can be complex, as a negative result does not definitively indicate no leakage. Ultimately, the consensus is that for precise measurement, specialized laboratory equipment would be necessary, making it more practical to replace the smoke detector instead.