Isotopes of samarium

Naturally occurring radioisotopes, ¹⁴⁷Sm (1.06×10¹¹y), ¹⁴⁸Sm (7×10¹⁵y) and ¹⁴⁹Sm (>2×10¹⁵y), with ¹⁵²Sm being the most abundant (26.75% natural abundance).