Of the four stable isotopes of lead, only 204Pb is non-radiogenic. . The mobility of uranium greatly limits the application of simple U)Pb isochron Three dating techniques exploit this situation, namely the U)Pb 'zircon' .. Preferential dissolution of 234U and radiogenic Pb from alpha-recoil-damaged lattice sites in zircon:
Lead isotopes are commonly used in dating rocks and provide some of the best 206Pb) are produced from the decay series of two different uranium isotopes A Pb-Pb isochron plots 207Pb, the daughter isotope of 235U, versus 206Pb, the Net website, also calls the assumptions of radioisotope dating into question.