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Topics. Reminder on:Sr-Nd-Pb-Hf-Os-NoblesExtinct nuclides (Dickin Ch 15):Al-MgPd-AgMn-CrFe-NiHf-W. The main radiogenic isotopes. Sr ? Nd ? Pb isotopes:mostly used for?. ?Specialist" systems. Hf isotopes useful to do ?. ?Os isotopes useful to do ?.?. Early Earth and extinct nuclides. U
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