Precious Tritium
One thing I have learned as a customs lawyer who does a lot of classification work is that there are millions of odd items moving in international trade the existence of which I am completely ignorant. Such is the case of the gaseous tritium light sources used in, among other things, firearm sights. These things use tritium sealed in a glass that has been coated in phosphor. The radioactive tritium decays, releasing beta particles, which interact with the phosphor causing it to emit light. In other words, it creates light with no external power source. Pretty cool. Tritium is, of course, a real thing. It is an isotope of hydrogen. We know this from the excellent documentary "Spider-Man." This comes up in relation to the Court of International Trade decision in Trijicon, Inc. v. United States in which the importer challenged the tariff classification of several versions of the gaseous tritium light sources ("GTLS"). The plaintiff uses them to make gun sights. The