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Shielding of Gamma Radiation by Using Porous Materials

100%
Gedik S., Baytaş A.
Acta Physica Polonica A
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2015
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vol. 128
|
issue 2B
B-174-B-175
EN
In this study, the gamma radiation attenuation was investigated for different composite metallic foams, soil and standard sand samples. Gamma transmission technique with narrow beam geometry, Co-60 radiation source were used in experimental studies. The measurements were used to calculate the linear attenuation coefficients and porosities of these materials. The results were compared according to radiation attenuation and porosity distribution of porous media. The metallic foams had large and non-homogeneous porosity values, therefore sand and soil showed better radiation attenuation property. However, the saturated silica foam had large ability of gamma ray attenuation as well as dry soil.
2
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Kinetic and Thermodynamic Behavior of Selenium on Modified Bentonite and Activated Carbon using Radiotracer Technique

52%
Tuğrul B., Erentürk S., Haciyakupoğlu S., Karatepe N., Altinsoy N., Baydoğan N., Baytaş F., Büyük B., Demir E., Gedik S.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 2B
B-180-B-181
EN
This study was aimed to determine kinetic and thermodynamic behaviors of selenium on modified bentonite and activated carbon. Thermodynamic parameters such as enthalpy ΔH, free energy change ΔG and entropy change ΔS of selenium adsorption suggested that the adsorption of Se(IV) on activated carbon and organic-inorganic modified bentonite was exothermic and endothermic process, respectively. The experimental data fitted very well the pseudo-second-order kinetic model for both adsorbents.
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