These dates were established by a variety of radiometric dating techniques, including samarium–neodymium (Sm–Nd), rubidium–strontium (Rb–Sr), potassium–argon (K–Ar), and carbon-14.
FOLLOWING tests of nuclear weapons in the 1950’s, strontium 90 (Sr90), a by-product of nuclear reactions, was found in baby teeth, reports the Globe and Mail newspaper of Canada.
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The most enriched elements are rubidium, strontium and barium, which between them account for over 50 percent by mass of all elements heavier than iron in the Earth's crust.
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In the early 1960s Franklin was one of a number of scientists who participated in the Baby Tooth Survey, a project founded by Eric and Louise Reiss along with other scientists such as Barry Commoner, which investigated levels of strontium-90—a radioactive isotope in fallout from nuclear weapons testing—in children's teeth.