نتایج جستجو برای: PAGATA Gel Dosimeter

تعداد نتایج: 106920  

Journal: :iranian journal of medical physics 0
bakhtiar azadbakht instructor, medical radiation engineering dept, faculty of engineering, borujerd islamic azad university, borujerd, iran. *, mohammad hassan zahmatkesh associate professor, shahid beheshti university, evin, tehran, iran kamal haddad associate professor, nuclear engineering dept, faculty of engineering, shiraz university, shiraz, iran. saeid bagheri m.sc. in medical physics, shahid beheshti university, tehran, iran

introduction: the pagat polymer gel dosimeter melts at 30 ˚c and even at room temperature during the summer, so it needs to be kept in a cool place such as a refrigerator. to increase the stability of the pagat gel, different amounts of agarose were added to the pagat gel composition and the pagata gel was manufactured. material and methods: the pagata gel vials were irradiated using a co-60 ma...

*, Mohammad Hassan Zahmatkesh Bakhtiar Azadbakht, Kamal Haddad Saeid Bagheri

Introduction: The PAGAT polymer gel dosimeter melts at 30 ˚C and even at room temperature during the summer, so it needs to be kept in a cool place such as a refrigerator. To increase the stability of the PAGAT gel, different amounts of agarose were added to the PAGAT gel composition and the PAGATA gel was manufactured. Material and Methods: The PAGATA gel vials were irradiated using a Co-60 ma...

Journal: :iranian journal of radiation research 0
n.n.a razak school of physics, university sains malaysia, 18000, pulau pinang, malaysia a.a. rahman 1school of physics, university sains malaysia, 18000, pulau pinang, malaysia s. kandaiya 1school of physics, university sains malaysia, 18000, pulau pinang, malaysia i.s. mustafa 1school of physics, university sains malaysia, 18000, pulau pinang, malaysia a.a. mahmoud 1school of physics, university sains malaysia, 18000, pulau pinang, malaysia n.z. yahaya school of distance education, university sains malaysia, 18000, pulau pinang, malaysia

background: an effective polymer gel dosimeter can be fabricated by varying the composition of its chemical components. materials and methods: the magat gel dosimeter formulations that used different compositions of methacrylic acid (maa) and gelatin were extensively investigated in the present study according to the r2–dose response and r2–dose sensitivity. the irradiation of magat gel was per...

Journal: :iranian journal of medical physics 0
hossein hasani m.sc. student in medical radiation engineering, science and research branch, islamic azad university, tehran, iran hasan nedaie assistant professor, radiotherapy and oncology dept., tehran university of medical sciences, cancer research center, center institute, tehran, iran mohammad hasan zahmatkesh associate professor, medical physics dept., novin medical radiation institute, tehran, iran mahmood allahverdi associate professor, medical physics dept., tehran university of medical sciences, tehran, iran saeid bagheri m.sc. of medical physics, novin medical radiation institute, shahid beheshti university, tehran, iran sajad mirzaie m.sc. student in medical radiation engineering, science and research branch, islamic azad university, tehran, iran

introduction: in radiotherapy, methods of treatment planning are becoming increasingly more complicated. this requires verification of the doses delivered to increasingly smaller and more precise regions. radiotherapy techniques are continuously employing smaller and smaller field sizes to deliver tighter radiation doses with higher therapeutic ratios, generating interest among researchers to p...

2014
S. M. Gafar

In this study the spectrophotometric response of the Toluidine Blue O (TBO)-gelatin gel dosimeter irradiated with gamma rays was characterized. Preparation of dyed-gelatin gel takes place in neutral medium; to give eventually gel dosimeter has a sharp absorbance peak at 635 nm that bleaches quantitatively upon irradiation and the colour change can be measured with UV-VIS spectrophotometer. The ...

Journal: :iranian journal of radiation research 0
d. shahbazi-gahrouei dr. d. shahbazi-gahrouei; dept. of medical physics, sharekord university of medical sciences, sharekord, iran.fax: +98-381-3334911

background: the compositions of ferrous sulphate, agarose and xylenol orange dye (fax) and ferrous sulphate, gelatin and xylenol orange dye (fgx) in solution of distilled water and sulphuric acid are two tissue-equivalent gel dosimeters. ionizing radiation causes oxidation of fe2+ ion to fe3+ ions which diffuse through the gel matrix and blur the image of absorbed dose over a period of hours af...

A.A. Mahmoud, A.A. Rahman, I.S. Mustafa, N.N.A Razak, N.Z. Yahaya, S. Kandaiya,

Background: An effective polymer gel dosimeter can be fabricated by varying the composition of its chemical components. Materials and Methods: The MAGAT gel dosimeter formulations that used different compositions of Methacrylic acid (MAA) and gelatin were extensively investigated in the present study according to the R2–dose response and R2–dose sensitivity. The irradiation of M...

2017
Heather M Whitney Daniel F Gochberg C Waldenberg A Karlsson Hauer

The normoxic polymer gel dosimeter based on N-isopropyl acrylamide (NiPAM) is a promising full 3D-dosimeter with high spatial resolution and near tissue equivalency. NiPAM gel samples were irradiated to different doses using a linear accelerator. The absorbed dose was evaluated using MRI and statistical significance of the analysed data was calculated. The analysis was carried out using an in-h...

Seyed Mohammad Mahdi Abtahi Vahid Anaraki

Introduction: Three physical conditions caused an external beam designated as a small field. The first is the loss of lateral charged particle equilibrium. The second is the effect of collimators on the primary photon source occlusion. The third condition is the size of the detector which is large compared to the field size. The most obvious perturbation effects in last condit...

Journal: :iranian journal of radiation research 0
k. adinehvand borujerd islamic azad university, borujerd, iran m.h. zahmatkesh novin radiation medicine institute, tehran, iran m.r aghamiri division of radiation medicine, shahid beheshti university, tehran, iran sh. akhlaghpour department of radiology, tehran university of medical sciences, tehran, iran s. bagheri novin radiation medicine institute, tehran, iran

background: the purpose of this study was to evaluate the dependency of magica polymer gel dosimeter response (r2) on different electron energies as well as on different mean dose rate for a standard clinically used linear accelerator. materials and methods: the sensitivity of the dosimeter was represented by the slope of calibration curve in the linear region measured for each modality. a cali...

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