Half life of tritium is 12 years, uranium 238 is over 4 billion years. But that means Tritium is enormously more radioactive. And because its an isotope of hydrogen, a gas, and it gets absorbed into plants and animals and the ground water.
The best thing to do with tritium is pump it back into your fusion reactor. It is actually better fuel than deuterium. A fusion reactor is going to become seriously radioactive from the neutron flux anyway, so you just have to engineer your way around that fact.
I'm not anti-nuclear. Just saying that fusion is not "clean" while fission is "dirty". That's a common misconception among journalists.