Tritium is actually being continuously produced by cosmic rays smashing up atoms in the detector. That's why these experiments are buried deep in mines, but eve

Tritium is actually being continuously produced by cosmic rays smashing up atoms in the detector. That's why these experiments are buried deep in mines, but even the small amount that get through the earth can cause problems in a sensitive detector. https://www.sciencedirect.com/science/article/abs/pii/S0927650517301895 https://www.sciencedirect.com/science/article/abs/pii/S09276...