Radon was not the only radioactive daughter product of uranium that captured my interest. Two more of these isotopes, 230Th (half life 75,000 years) and 234U (half life 250,000 years) dominated my research interests during the 1960s. Several graduate students also made their mark. Aaron Kaufman examined the possibility of using these isotopes to date shells and tufas from the Great Basin (Kaufman and Broecker, 1965). Tehlung Ku explored their use for dating deep sea sediments (Ku and Broecker, 1966). Michael Bender investigated their rise in determining the growth rate of the manganese nodules...

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