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Inthe American chemist Bertram Boltwood - proposed that rocks containing radioactive uranium could be dated by measuring the amount of lead in the sample. This was because uranium, as it underwent radioactive decaywould transmute into lead over a long span of time. Thus, the greater the amount of lead, the older the rock. Boltwood used this method, called radioactive datingto obtain a very accurate measurement of the age of Earth.