Investigation of the resistance of some naturally occurring and synthetic inorganic ion exchangers against gamma radiation |
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| Institution: | 1. Department of Anesthesiology, Weill Cornell Medical College, New York, New York;2. Department of Pathology, Weill Cornell Medical College, New York, New York;3. Department of Cardiac Surgery, University “G. d’Annunzio,” Pescara, Italy;4. Division of Cardiac Surgery, Department of Surgery, University of Massachusetts Chan Medical School, Baystate Medical Center, Boston, Massachusetts;5. Department of Surgery, Columbia University College of Physician and Surgeons, New York, New York;6. The Society of Thoracic Surgeons Research Center, Chicago, Illinois;7. Department of Cardiothoracic Surgery, Weill Cornell Medical College, New York, New York;1. Department of Resource and Environment, School of Metallurgy, Northeastern University, Shenyang, 110819, China;2. Liaoning Provincial Key Laboratory of Metallurgical Resources Recycling Science, Shenyang, 110819, China;3. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China;4. Department of Physics, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia;1. Department of Building Materials, Vilnius Gediminas Technical University, Saulėtekio 11, LT-10223 Vilnius, Lithuania;2. Research Institute of Buildings Materials and Products, Vilnius Gediminas Technical University, Saulėtekio 11, LT-10223 Vilnius, Lithuania;1. Medical Physics and Radiation Sciences Program, School of Physics, Universiti Sains Malaysia, 11800, Penang, Malaysia;2. Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, Alrayyan, 31113, P.O. Box: 838, Dammam, Saudi Arabia;3. Medical Imaging and Radiography Department, Aqaba University of Technology, Aqaba, Jordan |
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| Abstract: | The effect of various doses of gamma radiation on the ion-exchange capacity, distribution coefficient values, elution behaviour, physical effect, pH titration and infrared spectra of some synthetic inorganic ion exchangers, namely the cerium substituted phosphates; and naturally occurring inorganic ion exchangers, zeolites from different parts of Iran, have been studied systematically.No significant change has been observed in the ion-exchange capacity (with the exception of CeP(Na), CeP(Di·Na) and zeolite 5 (deposits of arababad talas)), elution behaviour, physical effect, chemical stability and the infrared spectra of the synthetic ion exchangers irradiated upto a total dose of 200 kGy, while a change has been observed in the pH-titration and distribution behaviour. The increase in pH is sharper for irradiated samples with divalent cations than for the normal samples. Furthermore, the Kd values, and hence the selectivity towards certain cations increase with the total dose absorbed, reaching its optimum selectivity with the dose of 50–100 kGy. The natural zeolites chosen for these studies, show, similar pattern to those of synthetic ion exchangers, and in some cases an extremely high selectivity toward certain cations, like BeII. These make, zeolites, which are naturally occurring ion exchangers more viable economically, and extremely useful alternative in this industry. |
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