How is tritium made in nuclear reactors?

In nuclear-fission reactors, tritium is produced through the nuclear reaction between lithium-6 and thermal neutrons.12

The process is represented by the following equation:

$${}^6\text{Li}{+}^{1}n{\to }^4\text{He}+\text{T}$$

In this reaction, a lithium-6 nucleus absorbs a neutron, resulting in the formation of a helium-4 nucleus and a tritium nucleus. This method is considered the most effective way to produce tritium artificially.13