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....
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