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s3-eu-west-1.amazonaws.com · Web viewCONCENTRATIONS. RATIOS. AGES. Sample. Analysis. U [ppm] 2 . Th [ppm] 2 . Pb [ppm] 2 . U/Tha. 207Pb/235Ub. 2 d. 206Pb/238Ub. 2 d. rhoc. 207Pb/206Pbe.
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