Radioactive cesium ( 137 Cs) is a common radionuclide that has a range of applications such as cancer therapy, radiation detection, mineral processing, and …

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This paper presents the microscopic characterization of two types of fly ash belite cements and their hydration products by means of scanning electron microscopy (SEM), energy ... The leach behavior of cesium from a series of cement-based waste forms has been modeled in terms of pore solution concentration and phase formation …

In this study, microstructural differences and changes in the adsorption capacity of cesium between cement and carbonated cement were investigated. Cement blocks were ground to powder for rapid carbonation, and microscopic variations were characterized by XRF, XRD, FT-IR, SEM, BET, and TGA.The characterization results …

This work aims to examine and understand Cesium binding in cement–bentonite single and binary matrices, where single matrices include Cesium ions and binary matrices contain both Cesium and Strontium ions. ... Where, the bonds between the hydration products are weak at early hydration time, by increasing the curing time …

Numerous low-level and intermediate-level radioactive wastes are generated from the decommissioning processes of nuclear power plants; these wastes are immobilized to prevent the release of radionuclides under disposal conditions. In this study, we investigated the leaching behavior of Cs, Sr, Co, and Eu, which are common in …

Diffusion and sorption in cementitious materials are important factors influencing radionuclide migration in radioactive waste disposal. Four different experimental techniques have been used to study these processes for Cs+, Sr2+, and I− ions in Sulphate Resisting Portland Cement paste saturated with water. The results of different experimental …

This study investigates the leaching behaviors of Cs, Sr, Co, and Eu immobilized in ordinary Portland cement (OPC) during a leaching test of 90 days. Stable Cs, Sr, Co, and Eu …

The adsorption of cesium on cement mortar from aqueous solutions was studied in series of bench-scale tests. The effects of cesium concentration, temperature and contact time on process kinetics and equilibrium were evaluated. ... Cesium is also one of the main products of nuclear fission and is therefore present in spent nuclear fuel [1], …

waste is an unavoidable by -product in nuclear energy pr o-duction (Plecas et al 1985). After volume reduction and valuable compon ent recovery, waste materials have to be conditioned by cement for transport, storage and disposal. Conditioning is the waste management step in which radio active waste is immobilized and packed. The obje c-

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Authors: Konstantin Volchek. Natural Resources Canada. Muhammed Miah. Noakhali Science & Technology University. Wenxing Kuang. Environment …

Cesium-137 is a common radioactive byproduct found in nuclear spent fuel. Given its 30 year half life, its interactions with potential storage materials—such as cement paste—is of crucial importance. … Expand

However, smaller particulates (<20 μm) and soluble fission product cations such as radioactive Cs + [8] may not be removed effectively [9]. ... [53] that because of the porosity of concrete, cesium can penetrate to a depth of 0.5–2 mm by hydraulic transport so that aggregate phases below the surface can provide binding sites. This suggests ...

Description: The sorption and desorption properties of radionuclides onto common building materials such as concrete are critical factors in the improvement of …

As Kd from radwaste elements in concrete systems show a wide range of values, a modelling of cesium and lead immobilization in Calcium Silicate Hydrate (CSH, xCaO.SiO 2 .H 2 O, with 0.7 (aged cements) SiOH) and precipitation equilibria. Values of Kd from cesium and lead in CSH matrix can thus be calculated with Ca/Si evolution and ionic …

The leaching rate of cesium has been studied in cement. The solidification matrix was a standard Portland cement with increased sulphate resisting properties …

Group 1: Alkali Metals and Carbonates (X 2 CO 3) is the reaction between Li, Na, K, Rb and Cs with CO 3. All except Lithium are soluble in water and stable to heat. Lithium Carbonate (Li2CO3) Uses: drug development. Chemical Characteristics: Low solubility in water. Unstable to heat. Appearance: white powder, fragrance-free.

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1. Introduction. Radioactive cesium (137 Cs) is a common radionuclide that has a range of applications such as cancer therapy, radiation detection, mineral processing, and construction industry.Cesium is also one of the main products of nuclear fission and is therefore present in spent nuclear fuel [1], [2].Release of the radioactive cesium into …

Abstract. As Kd from radwaste elements in concrete systems show a wide range of values, a modelling of cesium and lead immobilization in Calcium Silicate …

The leaching rate of cesium has been studied in cement. The solidification matrix was a standard Portland cement with increased sulphate resisting properties mixed with 300 kg/m 3 or 350 kg/m 3 powdered ion exchange resins, and with or without 5 weight-% zeolite added to the grout. The leaching rates from an ordinary cement matrix and a …

This study reports on the efficacy of various wash solution formulations in removing cesium from components of concrete. We identified several prevalent mineral …

Cesium-137 is a common radioactive byproduct found in nuclear spent fuel. Given its 30 year half life, its interactions with potential storage materials—such as …

The products transformation and leaching behavior in solidified cement matrices under the coupling actions of "water-heat-chemistry" Zhao Zheng Z. Bao Jun-jie Yang Maoxuan Cui Xue Ma Yuxiang Li Engineering, Materials Science

ABSTRACT Recently, extremely high dose rates were detected in the three-layer concrete plugs of the units 2 and 3 at the Fukushima Daiichi Nuclear Power Plant. The high dose rates suggest that there are some trapping effects of radioactive materials on shield plugs when gas species and aerosols (e.g. CsOH and CsI) are released from the …

Conclusion. This paper presented results of immobilization of cesium and strontium radionuclides loaded zeolite A ion exchange material in a mixture with OPC. The results showed that addition of up to 4 wt.% contaminated zeolite A leads to increase the compressive strength of the final solid matrix form 56.2 MPa in plain samples to 72.7 …

The leaching rate of 134Cs in cement has been studied. The solidification matrix by a standard Portland cement mixed with the spent ion-exchange resins was previously developed. The leaching rates from cement matrices were measured in function of pH, the immersion and curing times, the resin amounts, and 134Cs concentration. In …

The efficiency of innovative matrices for immobilizing cesium is presented in this work. The matrix formulation included the use of fly ash belite cement (FABC-2-W) and gismondine-type Na-P1 zeolite, both of which are synthesized from fly ash of coal combustion. The efficiency for immobilizing cesium is evaluated from the leaching test …

@misc{etde_20232411, title = {Composite apatitic cement as material to retain cesium and iodine; Elaboration de ciments apatitiques composites pour la retention du cesium et de l'iode} author = {Carpena, J, Donazzon, B, Ceraulo, E, and Prene, St} abstractNote = {A composite apatitic cement made of hydroxyapatite loaded with {beta} …