Migration of radionuclides in the enviroment

Jedináková-Křížová, V.

doi:10.1007/bf02389439

Cited by 31 publications

(8 citation statements)

References 2 publications

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“…Clay minerals have been proposed as suitable backfill materials because of their ability to adsorb cations and thus retard radionuclide migration to the biosphere. 1 The batch method was used, and prior to the sorption experiments pretreatment of the clay samples was carried out. This pretreatment step was intended to mimic the equilibrium existing between the natural clays and groundwater.…”

Section: Introductionmentioning

confidence: 99%

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Shahwan

Erten

2002

Journal of Radioanalytical and Nuclear Chemistry

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The sorption behavior of Cs + on kaolinite, chlorite-illite, and bentonite clays as a function of time, cation concentration, and temperature was studied using the radiotracer method. Sorption data were well represented by Freundlich and Dubinin-Radushkevich type isotherms. Bentonite was found to have the highest sorption capacity and the highest exchange affinity to Cs + . In all three cases Cs + sorption was found to be exothermic with ∆H° (kJ/mol) -13, -8, -19 and ∆S° (J/mol . K) -15, 31, and -3 for kaolinite, chlorite-illite, and bentonite, respectively. Negative ∆G° values were obtained in all cases, indicating the spontaneity of sorption. The magnitudes of ∆G° suggest that ion exchange is the primary sorption mechanism.

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Section: Introductionmentioning

confidence: 99%

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Shahwan

Erten

2002

Journal of Radioanalytical and Nuclear Chemistry

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“…The strontium isotope 90 Sr (with relatively long half-life of roughly 29 years) is a typical high-level radioactive component, the wastes of which are treated as one of the most dangerous products of nuclear fission for human beings. 1 Currently, many methods have been proposed for stabilization of radioactive ions. The first one is to use ionic exchangers for purification and volume reduction of liquid radioactive wastes, such as chabazite 2 and natural zeolites.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and investigation of langbeinite-related strontium- and iron-containing phosphates

Strutynska¹,

Slobodyanik²,

Shatalova³

2018

Turk J Chem

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The partial substitution of potassium atoms by strontium atoms in initial matrix K 3 Fe 2 (PO 4)3 with formation of complex phosphates K 3−2x Sr x Fe 2 (PO 4)3 (x = 0.75, 1.0, and 1.25) was determined using a solid-state reaction method. According to powder X-ray diffraction (XRD) data, the prepared phosphates with x = 1.0 and 1.25 crystallize in a cubic system (space group P 21 3) and belong to langbeinite family compounds, while for the sample with x = 0.75 a mixture of langbeinite-type phase and a minor amount of K 3 Fe 2 (PO 4)3 was obtained. The decreasing trend of lattice parameter a with increase of Sr amount in the phosphate confirmed the incorporation of strontium in the langbeinite-related structure. The thermal analysis results indicate that the obtained langbeinite-related compounds are stable upon heating and their melting points are higher than 1000°C. It should be noted that the determined ironcontaining phosphates can be obtained at temperature lower than 900°C, which creates a perspective for using them as matrixes for immobilization of radioactive strontium.

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“…For this purpose, large areas of deep ocean sediments are available, providing vast space free from seismic and tectonic disruption. Due to its low hydraulic conductivity, micro-porous structure, good sorption properties, and plasticity, bentonite is included in buffer and backfill materials in most high-level waste (HLW) repository concepts (Jedinakova-Krizova 1998). As an effective barrier, bentonite protects the canister and restricts the movement of radionuclides released from the waste packages after canister failure.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Creep and Swelling Behavior of Bentonite Mixed with Different Sand Contents Under Oedometric Condition

Tong

Yin

2011

Marine Georesources & Geotechnology

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Due to the viscous nature, especially the swelling property, bentonite is selected as buffer and backfill material for marine radioactive waste disposal. This article presents experimental results from one-dimensional oedometric compression tests with multi-stage loading and unloading=reloading on specimens of bentonite mixed with different sand contents. The sand contents are 50%, 60%, 70%, 80%, and 90%, respectively, in terms of the dry mass of sand over the dry mass of the mixture. Influences of sand contents on time-dependent stress-strain behavior of the bentonite-sand mixture under 1-D straining are examined with special attention to the nonlinear creep and swelling behavior. It is found that the bentonite-sand mixtures exhibit distinct nonlinear creep and swelling behavior that cannot be neglected. Moreover, a nonlinear creep function proposed by Yin (1999) for Hong Kong Marine Deposits has been modified to describe the nonlinear creep behavior of the bentonite-sand mixture.

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Migration of radionuclides in the enviroment

Cited by 31 publications

References 2 publications

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Synthesis and investigation of langbeinite-related strontium- and iron-containing phosphates

Nonlinear Creep and Swelling Behavior of Bentonite Mixed with Different Sand Contents Under Oedometric Condition

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