Interactive radiation portal - radiaverse.com
Half-life: 38 billion years
Main emission lines: 55keV, 202keV, 307keV
Lutetium is not found in nature in concentrated form. But you can buy it in chemical stores in different compound variants. also, scintillation crystals are made based on it. In nature, radiation from it is often interrupted by other isotopes, although the isotope itself is of natural origin.
