Decay-daughters Effects on Actinides Immobilization
New decay daughters have been gengerated in the decay process of Actinides,so the effects of alpha self-radiation damage and decay daughters should be considered in Actinides treatment and diaposal process. The security and stablity of Actinides immoblization depend to a great extent on the behavior of the new long-lived decay daughters. The changes of isotopes components versus decay time in241Am, 243Cm immoblization were calculated by the decay cascade method in this experiment. The results exhibit that the decay long-lived daughters are the main components of immmoblization in the long-term disposal period. Detailed experimental studies about zircon structure( AnSiO4) show that the unit cell volume increases linearly with the increasing ionic radius of the daughters An-site cations. The calculations indicate that in the long-term disposal period the cell volume expansion of241Am and243Cm zircon structure immoblization( AnSiO4) is 4% and 5% respectivly. The resistance of Actinides immoblization to radiation damage varies with the decay-daughters composition.