The gallium isn't what's producing the neutrinos; there's a radioactive source that the gallium is being irradiated by, and I believe that's the source: > In a

The gallium isn't what's producing the neutrinos; there's a radioactive source that the gallium is being irradiated by, and I believe that's the source: > In an underground lab shielded by a mountain of rock, highly radioactive material sits inside a vat of liquid gallium, blasting out particles called neutrinos that break the gallium down into atoms of germanium.