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    An applicable count rate saturation correction approach on gamma camera for I-131 labeled radiopharmaceuticals

    , Article Results in Physics ; Volume 12 , 2019 , Pages 1901-1904 ; 22113797 (ISSN) Haghighatafshar, M ; Piruzan, E ; Entezarmahdi, S. M ; Shekoohi Shooli, F ; Parishan, M. R ; Sharif University of Technology
    Elsevier B.V  2019
    Background: Gamma camera count rate saturation and high-rate dead time are the most important problems of quantitative measurement in dosimetric studies. In this study, we aimed to assess an algorithm for correction of the measured counting rates in the entire energy spectrum (327–400 keV) for camera dead-time effects. Methods: In our study, whole body (WB) scan was performed by using a tissue-equivalent phantom, and that the radioactive Iodine (I-131) source with activities of 0.3, 0.6, 1.2, 1.5, 2.07, 2.7, 3.7, and 5.55 GBq was applied. WB scans of the 20% width energy windows were acquired for 420 s. Results: Camera dead-time parameters were obtained from different activities of I-131 in... 

    Polymeric reservoirs for controlled release of iodine in drinking water

    , Article Scientia Iranica ; Volume 6, Issue 5 , 2000 , Pages 143-146 ; 10263098 (ISSN) Abdekhodaie, M. J ; Mohseni, A. R ; Sharif University of Technology
    Sharif University of Technology  2000
    In this paper, different polymers are utilized for controlling the release rate of iodine in drinking water to counteract iodine deficiency. Polyethylene, polyvinyl chloride and ethylene vinyl acetate copolymer are used to fabricate polymeric reservoirs of Nal. Zero-order release kinetics with different release rates has been achieved through choosing different materials and various formulation factors. The experimental results are consistent with the expectation that by using a polymer with a greater permeability or a device with a large release area, higher release rate could be achieved  

    Trimethylsilyl cyanide addition to carbonyl compounds under neutral condition catalyzed by iodine

    , Article Phosphorus, Sulfur and Silicon and the Related Elements ; Volume 178, Issue 10 , 2003 , Pages 2111-2115 ; 10426507 (ISSN) Azizi, N ; Saidi, M. R ; Sharif University of Technology
    Taylor and Francis Ltd  2003
    Reaction of trimethylsilyl cyanide with aliphatic or aromatic aldehydes and ketones in the presence of a catalytic amount of elemental iodine produced the corresponding cyanohydrin trimethylsilyl ethers in very short time and high yields  

    Modeling of platinum extraction from used reforming catalyst in iodine solutions

    , Article ECS Transactions ; Volume 41, Issue 17 , 2012 , Pages 45-51 ; 19385862 (ISSN) ; 9781607683070 (ISBN) Moghaddam, H. R ; Baghallha, M ; Sharif University of Technology
    Platinum extraction from spent reforming catalysts in iodine solutions under atmospheric pressure and at temperatures up to 95°C was previously investigated in our group. In this system, platinum is oxidized from the spent catalyst with tri-iodide. In some of the experiments, it was observed that platinum extraction peaked and then decreased. This indicates that a precipitation reaction slowly occurs that removes the dissolved Pt ions from the solution. Power-law rate equation for the Pt extraction to PtI6 2- and the precipitation of the dissolved platinum to PtI 4(s) was implemented to model the experimental Pt extraction data. The activation energies for the platinum dissolution reaction... 

    Comparative study on adsorption of iodine vapor by silica-supported Cu nanoparticles and micronized copper

    , Article Industrial and Engineering Chemistry Research ; Volume 51, Issue 47 , 2012 , Pages 15315-15323 ; 08885885 (ISSN) Outokesh, M ; Saket, A ; Ahmadi, S. J ; Hosseinpour, M ; Khanchi, A. R ; Sharif University of Technology
    The current study is aimed at comparison of adsorption behaviors of silica-supported Cu nanoparticles (Si-N-Cu) and micrometric copper powder (Mi-Cu) for uptake of iodine vapor. The Si-N-Cu was synthesized by the decomposition of aqueous Cu(NO3)2 solution at supercritical condition, followed by reduction of the sample by H 2-N2 mixture. The Si-N-Cu sample with 29.4 nm Cu particles adsorbed 95% of I2 at partial pressure 10-5 bar in 1 h, while the 1 μm Mi-Cu adsorbed 51% of iodine in 6 h, indicating higher yield and faster kinetics of the nanometric sample. Theoretical analysis revealed the existence of a strong thermodynamic size effect in the Cu-I2 reaction system, so that molar |ΔG| for 2... 

    , M.Sc. Thesis Sharif University of Technology (Author) ; Matloubi Moghaddam, Firouz (Supervisor)
    Fused pyrimidines have attracted considerable attention recently in synthetic organic chemistry because of their wide range of biological activities pharmaceutical, therapeutic properties, antibacterial, antiviral, antitumor, and anti-inflammatory activities. We have reported a new and efficient synthesis of dihydro and tetrahydro pyrimidines fused to 2H-chromen-2-oneand cyclohex-2-enone and pyrimidine fused to uracil via two component reaction of 4-amino-2H-chromen-2-one, 3-aminocyclohex-2-enone and6-aminouracilto 1-aryl-N,N'-bis(arylmethylene)methanediaminein the present of iodine as catalyst.Molecular iodine has received considerable attention in the last few years due to inexpensive,... 

    Study of the mechanism of methyl iodide decomposition on Cu(110) surface: A UBI-QEP-based approach

    , Article Langmuir ; Volume 17, Issue 3 , 2001 , Pages 583-587 ; 07437463 (ISSN) Azizian, S ; Gobal, F ; Sharif University of Technology
    The decomposition of methyl iodide on Cu(110) surface gives rise to the production of methane, ethane, and ethene over a wide range of its surface coverage. In this work a reaction mechanism based on the adsorption and subsequent surface dissociation(s) of methyl iodide followed by the recombination and desorption of the surface entities are proposed on the basis of the energetic criteria provided by the unity bond index-quadratic exponential potential method. To further amplify the arguments using the calculated activation energies of the surface reactions, desorptions, etc., the Arrhenius factor is obtained by simulation of the temperature-programmed desorption patterns fitted to the... 

    Mechanism of catalytic decomposition of CH3I on the Cu(111) surface: A UBI-QEP approach

    , Article Langmuir, Washington, DC, United States ; Volume 16, Issue 21 , 2000 , Pages 8095-8099 ; 07437463 (ISSN) Azizian, S ; Gobal, F ; Sharif University of Technology
    ACS  2000
    The method of unity bond index-quadratic exponential potential (UBI-QEP) and the computer simulation of the temperature programmed desorption (TPD) patterns are employed to derive the kinetic and thermodynamic parameters associated with the steps of the pathway we propose for the catalytic decomposition of methyl iodide on the Cu(111) surface. Assuming a highly reactive `hot methyl' surface intermediate and on the basis of our calculations it is concluded that the desorption of a part of this species is responsible for the reported methyl radical TPD peak at 140 K, while a part of this surface species is trapped in the three-fold sites of the Cu(111) surface and desorbs to form the reported... 

    Synthesis of Graphene and Graphene Oxide and It’s Applications for Adsorption of Iodine

    , M.Sc. Thesis Sharif University of Technology Rizehkar, Sevda Sadat (Author) ; Outokesh, Mohammad (Supervisor) ; Khanchi, Alireza (Supervisor)
    Graphene is pure carbon in the form of a very thin, nearly transparent sheet, one atom thick. It is remarkably strong for its very low weight. Graphene is a novel particle that can improve adsorption properties. We use graphene for Iodine gas adsorption. Iodine-131 (usually in the chemical form of iodide) is a component of nuclear fallout, and is particularly dangerous owing to the thyroid gland's propensity to concentrate ingested iodine, where it is kept for periods longer than this isotope's radiological half-life of eight days. For this reason, if people are expected to be exposed to a significant amount of environmental radioactive iodine (iodine-131 in fallout), they may be instructed... 

    Facile and efficient one-pot protocol for the synthesis of benzoxazole and benzothiazole derivatives using molecular iodine as catalyst

    , Article Synthetic Communications ; Volume 36, Issue 17 , 2006 , Pages 2543-2548 ; 00397911 (ISSN) Matloubi Moghaddam, F ; Rezanejade Bardajee, G ; Ismaili, H ; Taimoory, S. M. D ; Sharif University of Technology
    Rapid and efficient condensation reactions of 2-aminothiophenol and 2-aminophenol with various aldehydes were carried out using I2 in solvent-free conditions with or without microwave irradiation to afford the corresponding 2-substituted benzothiazole and benzoxazole derivatives in good to excellent yields. Copyright © Taylor & Francis Group, LLC  

    Mixing in a novel double coaxial spinning disks reactor

    , Article Chemical Engineering and Processing - Process Intensification ; Volume 159 , 2021 ; 02552701 (ISSN) Mirzaei, M ; Molaei Dehkordi, A ; Bagheri Farahani, H ; Sharif University of Technology
    Elsevier B.V  2021
    High mixing efficiency that is of great importance in various industrial processes is a significant feature of spinning disk reactors. This work was focused on the characterization of mixing in a new reactor called Double Spinning Disk Reactor (DSDR) by adopting a competitive parallel reaction system known as iodide–iodate test reaction. The proposed DSDR consists of two coaxial rotating disks that the feeds are introduced into the gap between them. The mixing improves with an increase in the rotational speed of the disk, the radial distance of the feed introduced through the lower disk, and its number of feed points, while an increase in each of the feed flow rate and the distance between... 

    Iodine-131 radiolabeling of poly ethylene glycol-coated gold nanorods for in vivo imaging

    , Article Journal of Labelled Compounds and Radiopharmaceuticals ; Volume 56, Issue 1 , 2013 , Pages 12-16 ; 03624803 (ISSN) Eskandari, N ; Yavari, K ; Outokesh, M ; Sadjadi, S ; Ahmadi, S. J ; Sharif University of Technology
    Gold nanorods (GNRs) can be used in various biomedical applications; however, very little is known about their in vivo tissue distribution by radiolabeling. Here, we have developed a rapid and simple method with high yield and without disturbing their optical properties for radiolabeling of gold rods with iodine-131 in order to track in vivo tissue uptake of GNRs after systemic administration by biodistribution analysis and γ-imaging. Following intravenous injection into rat, PEGylated GNRs have much longer blood circulation times. We have developed a rapid and simple method for radiolabeling of gold rods with iodine-131 in order to track in vivo tissue uptake of gold nanorods after systemic... 

    3D calculation of absorbed dose for 131I-targeted radiotherapy: A monte carlo study

    , Article Radiation Protection Dosimetry ; Volume 150, Issue 3 , October , 2012 , Pages 298-305 ; 01448420 (ISSN) Saeedzadeh, E ; Sarkar, S ; Abbaspour Tehrani Fard, A ; Ay, M. R ; Khosravi, H. R ; Loudos, G ; Sharif University of Technology
    Various methods, such as those developed by the Medical Internal Radiation Dosimetry (MIRD) Committee of the Society of Nuclear Medicine or employing dose point kernels, have been applied to the radiation dosimetry of 131I radionuclide therapy. However, studies have not shown a strong relationship between tumour absorbed dose and its overall therapeutic response, probably due in part to inaccuracies in activity and dose estimation. In the current study, the GATE Monte Carlo computer code was used to facilitate voxel-level radiation dosimetry for organ activities measured in an . 131I-treated thyroid cancer patient. This approach allows incorporation of the size, shape and composition of... 

    Characteristics and composition of watermelon seed oil and solvent extraction parameters effects

    , Article JAOCS, Journal of the American Oil Chemists' Society ; Volume 87, Issue 6 , 2010 , Pages 667-671 ; 0003021X (ISSN) Moaddabdoost Baboli, Z ; Safe Kordi, A. A ; Sharif University of Technology
    Watermelon seed oil characteristics were evaluated to determine whether this oil could be exploited as an edible oil. Hexane extraction of watermelon seeds produced yields of 50% (w/w) oil. The refractive index, saponification and iodine value were 1.4712 (at 25 °C), 200 mg KOH/g and 156 g I/100 g, respectively. The acid and peroxide values were 2.4 mg KOH/g and 3.24 mequiv/kg, respectively. The induction time of the oil was also 5.14 h at 110 °C, which was measured for the first time. Total unsaturation contents of the oil was 81.6%, with linoleic acid (18:2) being the dominant fatty acid (68.3%). Considering that the watermelon seed oil was highly unsaturated, the relatively high induction... 

    Synthesis of Gold Nanoparticles and Study on Their Applications as a Catalyst and as a Carrier for the Radiomedicines

    , M.Sc. Thesis Sharif University of Technology Eskandari, Najmeh (Author) ; Outokesh, Mohammad (Supervisor) ; Ahmadi, Javad (Supervisor) ; Sadjadi, Soude (Co-Advisor)
    This thesis encompasses two parallel, but independent subjects as follow: The first part of the thesis deals with synthesis of bimetallic Ni-Au nanoparticles (Bi Ni-Au), and application of them as electrodes in the methanol fuel cells. The Bi Ni-Au nanoparticles for this purpose were synthesized by controlled reduction of HAuCl3 and NiCl3 in the aqueous medium using NaBH4 as reductant and PVP as stabilizer, and immobilized on the surface of a glassy carbon (GC) electrode by means of Nafion polymer. The obtained electrode then was conditioned in an alkaline solution by cyclic voltammetric method in potential range 100 -700 mV (vs. Ag/AgCl). Physicochemical characterizations of the... 

    Synthesis of Pyrimidine Derivatives Fused to Pyrazol Ring Using Iodine-Catalyzed Two Component Reaction & Synthesis and Application of Magnetic Nickel Ferrite Nanoparticles in the C-N Bond Formation

    , M.Sc. Thesis Sharif University of Technology Moafi, Atiyeh (Author) ; Matloubi Moghadam, Firouz (Supervisor)
    The fused pyrimidine rings have many biological applications such as antibacterial, antiviral, antitumor and anti-inflammation activity. Therefore, their synthesis has attracted many attentions. In this thesis, the synthesis of fused pyrazolopyrimidine rings through two component reaction catalyzed by iodine was investigated. In this reaction, iodine is used to active the imine bond. Low toxicity, availability, low cost and stability to air are some benefits of iodine as a Lewis acid leading to widespread application of I2 in many different organic transformation. Mild reaction conditions, high yields and lower reaction times are among the main advantage of these reactions.
    Another part... 

    Synthesis of Copper Oxide Nano Particles by Supercritical Hydrothermal Method and Study on Their Adsorption Properties for uptake of Elemental Iodine and Radioactive Ions

    , M.Sc. Thesis Sharif University of Technology Saket Bolgoori, Arezoo (Author) ; Otukesh, Mohammad (Supervisor) ; Ahmadi, Javad (Supervisor) ; Samadfam, Mohammad (Co-Advisor)
    I-131 isotope is one of the most significant radio medicines for treatments of the thyroid cancer and nuclear tomography of thyroid. As for purification of this radioisotope several methods have been developed among which adsorption-desorption on metallic copper is the most promising. The current study is aimed at elaboration of the kinetics behavior of the different types of metallic copper for adsorption of iodine vapor. The used copper samples included plain and silica-supported Cu nanoparticles as well as micronized copper. The silica-supported Cu nanoparticles were prepared by impregnation of highly porous silica (≈500 m2/g) in Cu(NO3)2 solution, heating of the solution to above... 

    Charge Transfer Complexes of Substituted Bis (thiophen-2-Ylmethylene)Benzene-1,4-Diamine Schiff Bases with Iodine and TCNE

    , M.Sc. Thesis Sharif University of Technology Pourhadi kalebasti, Hadi (Author) ; Mohammadi Boghaei, Davar (Supervisor)
    The charge transfer interaction of two Schiff-bases 2,5-dichloro -bis(thiophen-2-ylmethylene)benzene-1,4-diamine and 2,5-dimethyl-bis(thiophen-2- ylmethylene) benzene-1,4-diamine as donors with I2 and TCNE ethylene as acceptors have been studied spectrophotometrically.
    The formation constants and extinction coefficients of charge transfer complexes have been determined by graphical as well as iterative methods. From measurements at different temperatures the thermodynamic functions of the charge transfer complex formation have been studied. The temperature dependence of the K can be used for the determination of the thermodynamic reaction quantities (ΔG, ΔS, ΔH) for linear regression... 

    Study of 131I Adsorption Behavior on Nanoporous Silicates Modified with Elements of Ag, Cu, Zn, Ni

    , M.Sc. Thesis Sharif University of Technology Rohani, Ramezan (Author) ; Sayf Kordi, Ali Akbar (Supervisor) ; Sepehrian, Hamid (Supervisor)
    One of the common methods used for treatment of gaseous radioactive wastes in nuclear waste management is adsorption process. Nanoporous materials have found great utility as sorption media because of their large internal surface area and more adsorption sites than other adsorbents, which caused the increasing attention of researchers to use them in the nuclear waste management. Hence in this study, the surface of nanoporous silicates of SBA-15 and MCM-41 modified with d-block elements of the periodic table such as silver, copper, zinc and nickel by wet impregnation method. After characterization by different techniques such as X-ray diffraction, nitrogen gas porosimetry, Fourier... 

    Simulation and Evaluation of Dosimetric Parameters of 125I Thermobrachytherapy Source with Ferromagnetic Core

    , M.Sc. Thesis Sharif University of Technology Soleymanpoor, Mohammad (Author) ; Hosseini, Abolfazl (Supervisor) ; Sheibani, Shahab (Supervisor) ; Poorbaygi, Hossein (Co-Supervisor) ; Mohagheghpour, Elham (Co-Supervisor)
    In the method treatment of thermobrachytherapy, the method of this project, simultaneously use of two processes of thermotherapy and brachytherapy is considered, which can be a more effective treatment for the destruction of tumor tissue. In thermotherapy, the temperature of the tissue is artificially raised to a temperature that leads to cell dysfunction resulting in cell death. In brachytherapy, the destruction of defective tissue is done by placing a source in the tissue. In the present project, we supposed to consider both mechanisms simultaneously for treatment at the same time. In this project, radioactive material 125I is used as a source of radiation emission for brachytherapy. In...