$30000 a gram. Tritium is one of Earth's most expensive substances
Tritium is Expensive! Cost: $30,000 per gram. Gaseous Tritium is also used in self-luminous fire safety signs which offer users the most advantageous life-cycle cost of any permanantly illuminated fire safety sign. Typically having a service life of 10+ years, self-luminous signs need no technical maintenance or spare parts during that time....