Word: lead
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Dates: during 1930-1939
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...tracing back this ancient peculiarity, scientists may find that the ordinary lead atom carries within it at least a partial record of physical and chemical development when the earth was young. For one thing, a continuation of this study promises to reveal important clues as to the mechanism of the formation of lead ores...
This belief arose when Dr. Nier found that the oldest deposits of ordinary lead tend to have more of the isotope 204 in proportion to the isotopes 206, 207, and 208, than the younger deposits...
...Ordinary lead, which has the isotopes 204, 206, 207, and 208, is the only lead to have the isotope 204; uranium lead is in two isotopes, 206, and 207; and thorium ends up in a lead of only one form, weighing 208 units...
...Lead is one of seventeen elements which Dr. Nier has studied, beginning a comprehensive program of research which will eventually put every one of the ninety-odd known fundamental substances through his spectrometer...
...facilities which exist at present, and eventually to give the field a home of its own. Sooner or later there should be a wider variety of basic courses offered especially for men in this field, such as physical chemistry, bio-physics and perhaps the present Chemistry 44. This should lead to the creation of Professors in this field for its has heretofore been considered a subfield buried among the sciences...