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Stable Lanthanum Isotopes - La Isotopes
Nominal mass	Accurate mass	% Natural abundance	Chemical form	Enrichment available %

¹³⁸La	137.907105 (6)	0.09 (1)	Oxide	6 - 11+

¹³⁹La	138.906347 (5)	99.91 (1)	Oxide	99+

Both Lanthanum Isotopes do not appear to have many applications. Only La-139 is used for the production of the medical radioisotope Ce-139.