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Physico-chemical studies on some new dosimeters for possible use in radiation processing dosimetry / Soad Magdy Tadros Michael ; Supervised Magdi Mikhail Naoum , Gamal Riad Saad , Wafaa Bader Eldin Mostafa

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Soad Magdy Tadros Michael , 2021Description: 180 P. : charts , facsimiles ; 25cmOther title:
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Dissertation note: Thesis (Ph.D.) - Cairo University - Faculty of Science - Department of Physical Chemistry Summary: The first part of this thesis aims to develop and optimize the formulation of a radiation-sensitive material of silver nitrate in gelatin, a capping agent, to prepare radiochromic gel dosimeters suitable for dosimetry applications up to 100 Gy. Gamma radiation-induced Ag nanoparticles (NPs) formation in silver nitrate gel dosimeter at different silver nitrate concentration, gelatin %, isopropanol % and pH was investigated. The absorption spectrum of the Þ-irradiated gel dosimeter exhibited a Surface Plasmon Resonance band (SPR) at a wavelength of 450 nm nm indicating AgNPs formation upon Þ-irradiation.The intensity of this peak grows linearly with increasing absorbed doses up to 100 Gy. The sensitivity of radiation increases with the increase of Ag⁺ ion concentrations and the decrease of gelatin content. In addition, using isopropanol enhanced the development of AgNPs in the gel dosimeter. The increase of isopropanol in the gel (100 mM The first part of this thesis aims to develop and optimize the formulation of a radiation-sensitive material of silver nitrate in gelatin, a capping agent, to prepare radiochromic gel dosimeters suitable for dosimetry applications up to 100 Gy. Gamma radiation-induced Ag nanoparticles (NPs) formation in silver nitrate gel dosimeter at different silver nitrate concentration, gelatin %, isopropanol % and pH was investigated. The absorption spectrum of the Þ-irradiated gel dosimeter exhibited a Surface Plasmon Resonance band (SPR) at a wavelength of 450 nm nm indicating AgNPs formation upon Þ-irradiation. The intensity of this peak grows linearly with increasing absorbed doses up to 100 Gy. The sensitivity of radiation increases with the increase of Ag+ ion concentrations and the decrease of gelatin content. In addition, using isopropanol enhanced the development of AgNPs in the gel dosimeter. The increase of isopropanol in the gel (100 mM Ag+) from 0 to 20% enhanced the radiation sensitivity by 16.75%
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Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.12.11.Ph.D.2021.So.P (Browse shelf(Opens below)) Not for loan 01010110084884000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.12.11.Ph.D.2021.So.P (Browse shelf(Opens below)) 84884.CD Not for loan 01020110084884000

Thesis (Ph.D.) - Cairo University - Faculty of Science - Department of Physical Chemistry

The first part of this thesis aims to develop and optimize the formulation of a radiation-sensitive material of silver nitrate in gelatin, a capping agent, to prepare radiochromic gel dosimeters suitable for dosimetry applications up to 100 Gy. Gamma radiation-induced Ag nanoparticles (NPs) formation in silver nitrate gel dosimeter at different silver nitrate concentration, gelatin %, isopropanol % and pH was investigated. The absorption spectrum of the Þ-irradiated gel dosimeter exhibited a Surface Plasmon Resonance band (SPR) at a wavelength of 450 nm nm indicating AgNPs formation upon Þ-irradiation.The intensity of this peak grows linearly with increasing absorbed doses up to 100 Gy. The sensitivity of radiation increases with the increase of Ag⁺ ion concentrations and the decrease of gelatin content. In addition, using isopropanol enhanced the development of AgNPs in the gel dosimeter. The increase of isopropanol in the gel (100 mM The first part of this thesis aims to develop and optimize the formulation of a radiation-sensitive material of silver nitrate in gelatin, a capping agent, to prepare radiochromic gel dosimeters suitable for dosimetry applications up to 100 Gy. Gamma radiation-induced Ag nanoparticles (NPs) formation in silver nitrate gel dosimeter at different silver nitrate concentration, gelatin %, isopropanol % and pH was investigated. The absorption spectrum of the Þ-irradiated gel dosimeter exhibited a Surface Plasmon Resonance band (SPR) at a wavelength of 450 nm nm indicating AgNPs formation upon Þ-irradiation. The intensity of this peak grows linearly with increasing absorbed doses up to 100 Gy. The sensitivity of radiation increases with the increase of Ag+ ion concentrations and the decrease of gelatin content. In addition, using isopropanol enhanced the development of AgNPs in the gel dosimeter. The increase of isopropanol in the gel (100 mM Ag+) from 0 to 20% enhanced the radiation sensitivity by 16.75%

Issued also as CD

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