I'm looking in to a science fair project involving proving the existence of tritium in the exhaust of a Farnsworth fusor, and was wondering what the ideal method to prove it is. I've thought of three so far. The first is ionizing the gas and analyzing the spectra. The second is placing an alpha particle detector in a vacuum chamber filled with the gas. And the third is liquefying the gas and evaporating them off to collect and separating them. Ideas/opinions?