Word: nier
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...Nier Makes Discovery...
...discovery was made by Dr. Alfred O. Nier, National Research Fellow in the Harvard Physics laboratories, and resulted from his development of the most delicate atom "sifter" known to science...
Technically known as a mass spectrometer, Dr. Nier's instrument is designed to detect the presence of rare isotopic forms and also to give the most accurate measures even made of the relative abundance of different isotopes present in an element...
Ordinary lead's peculiar isotope distribution dates back millions of years and was probably caused by the early "contamination" of ordinary lead in its active elements uranium and thorium, Dr. Nier believes. This theory has yet to be thoroughly investigated...