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¹⁵²Gd (t_½ = 1.08×10¹⁴ years), ¹⁵⁰Gd (t_½ = 1.79×10⁶ years), and ¹⁴⁸Gd (t_½ = 86.9 years). All remaining radioisotopes have half-lives less than a year, and the majority have half-lives less than two minutes. Radioisotopes of gadolinium with mass numbers at or below 147 primarily decay via electron capture into isotopes of europium, while

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