Interpretation of the results of a field experiment on radionuclide migration in groundwater

Lekhov, A.V.; Shvarov, Y.V.; Shvarova, O.Y.

Авторы: Lekhov A.V., Shvarov Y.V., Shvarova O.Y.
Журнал: Geochemistry International
Том: 40
Год издания: 2002
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: S125
Последняя страница: S131
Аннотация: Numerical modeling was used to study radioactive waste migration taking into account physicochemical transformations in the water-rock system. The method of periodically activated sequential reactors was applied for conditions characteristic of the sites of radioactive waste injection (Tomsk and Krasnoyarks). It was shown that in aquifers composed of sandy-clayey rocks, carbonate minerals play the leading role in the elimination process of both strontium-90 and cesium-137, which does not form its own minerals. Strontium elimination occurs through the precipitation of strontianite, strontium-bearing calcite, and sorption in an exchange complex. Cesium is removed from solution only by sorption. The fundamental role in the decrease in strontium concentration is played by the process of siderite replacement by iron hydroxide and the process of complete or partial calcite dissolution. The concentrations of the radioactive cesium and strontium isotopes decline abruptly at these processes. The model explains the experimentally observed mobility of small concentrations of radionuclides at the migration rates of neutral conservative component of injected solutions. The front of the zone of high radionuclide concentrations moves faster than was predicted by laboratory experiments.
Добавил в систему: Шваров Юрий Всеволодович

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Interpretation of the results of a field experiment on radionuclide migration in groundwaterстатья