Assertion: hafnium's isotope | /r/HasProperty | hafnium
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text: Michael Bau from the Jacobs University Bremen), came to the surprising result - 2,700 million years ago, seawater contained an unusually high abundance of the radioactive isotope Hafnium 176 but a comparably low abundance of the radioactive isotope Neodymium 143, similar to what can be observed in present day seawater.