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5. How much of a difference in 176Hf/177Hf does one epsilon unit actually represent? (For instance, what is the difference in 176Hf/177Hf between a sample

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5. How much of a difference in 176Hf/177Hf does one epsilon unit actually represent? (For instance, what is the difference in 176Hf/177Hf between a sample with an epsilon value of +2 and an epsilon value of +1 ?) for 87Rb=1.421011yr1143Nd/144Nd of CHUR today =0.512638 for 147Sm=6.541012yr1147Sm/144Nd of CHUR today =0.1967

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