Modeling Stduy of Effects of Short-Lived Radionuclide Fixation on Decay Chain Radionuclides Migration.

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Effects of a short lived radionuclide fixation to minerals during alteration process from a primary mineral (Ml) to tertiary mineral (M3) through secondary mineral (M2) on a decay chain radionuclides migration (DCRM) have been studied based on mathematical simulation studies. The mathematical migration model in which a daughter radionuclide, N2, corresponds to a short lived radionuclide and is fixed to M2 during alteration from M1 to M2, is proposed.<BR>Also, a fraction of the granddaughter radionuclide, N3, is assumed to be released from M2 into a solution during the alteration process from M2 to M3.<BR>The model studies lead the delay in the migration of N3, with the delay becoming remarkably enhanced if the fixation rate constant of N2 is greater than the decay constant of N2.<BR>Whereas, the delay is reduced by the release of N3 with a faster rate than the decay constant of N3. Therefore, it is important clarify decay chain radionuclides fixation and release mechanisms during an alteration process.
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