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corrections about 235U

235U does not decay to 238U.  it decays to 231Pa (its next relatively stable
daughter), and eventually to 207Pb.  
238U decays to 234U via 234Th, and eventually to 206Pb.
Finally 232Th decays via a long chain to 208Pb.

Bonnie Blackwell,                               bonn@qcvaxa.acc.qc.edu
Dept of Geology,                                (718) 997-3332
Queens College, City University of New York,    fax:  997-3349
Flushing, NY 11367-1597