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Samarium-Neodymium

Sm-147 Nd-143 (Half Life 1.06 b.y.)

Nd goes into melt more than Sm

Mantle: Low Abundance, High Sm/Nd

Granite: High Abundance, Low Sm/Nd

Nd-144 = 24% of Nd

Nd-144 has half life 2.3 x 1015 years

Can use isochron methods with Nd-144 or Nd-142 (Stable, 22% of Nd)

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