Tritium's half-life is 12.5 yr. While I haven't looked up the statistical significance of the 53 excess events, it would take at most six half-lives to hammer t

Tritium's half-life is 12.5 yr. While I haven't looked up the statistical significance of the 53 excess events, it would take at most six half-lives to hammer that to below one. Sometimes waiting works (in the absence of any cosmogenics or radionuclide support for the background), but a good assay and background model is generally much faster.