Topic summary
Lithium-6

Extracted from the Wikipedia article Isotopes of lithium.
Lithium-6
Lithium-6 is valuable as the source material for the production of tritium (hydrogen-3) through absorption of neutrons. Between 1.9% and 7.8% of terrestrial lithium consists of lithium-6, with the rest being lithium-7. Large amounts of lithium-6 have been separated out for use in thermonuclear weapons.