نتایج جستجو برای: dosimetery

تعداد نتایج: 19  

Journal: :African Journal of Biotechnology 2013

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Journal: :iranian journal of radiation research 0
f. bouzarjomehri department of medical physics and environment health, shahid sadoghi university of medical sciences, yazd, iran m.h. ehrampoosh department of medical physics and environment health, shahid sadoghi university of medical sciences, yazd, iran

background: indoor radon gas (222rn) has been recognized as one of the health hazards for human. air radon comes mainly from basement soil and construction materials. saghand region with rich uranium mines lies 180 km from yazd, so the indoor radon concentration can be high. yazd, with population of about 457000, is the biggest city near saghand, thus, indoor gamma background radiation of yazd ...

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2008
Tim Monahan Shudong Jiang Brian Pogue

Photodynamic therapy dosimetery and treatment planning is affected by the concentration of photosensitizer in a given tissue, and these values are often estimated based on measurements of fluorescence in the region to be treated. Some studies with benzoporphyrin derivate monoacid ring a (BPD-MA) showed a significant increase in fluorescence quantum yield with deoxygenation of the solution, indi...

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ژورنال: مجله دانشکده پزشکی دانشگاه علوم پزشکی تهران 2006
امیرحسین گودرزی, , بهرام بلوری, , سید ربیع مهدوی, , علیرضا نیکوفر, , کریم قاضی خانلو ثانی, ,

Background: During breast three fields radiotherapy, the problem is that the divergency of the field interferes with matching the edges. So the matching point of these supraclav and tangential field will suffer from over-dose and under-dose. To prevent these these divergency, a half- block is often applied at supracluv field. Also in some techniques like collimator and couch rotation, corner bl...

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2015
A. R. Farajollahi F. Bouzarjomehri M. Kiani

INTRODUCTION In radiation therapy centers across Iran, protection of normal tissues is usually accomplished by either Cerrobend or lead block shielding. In this study, the influence of these two shielding methods on central axis dose distribution of photon beam a Cobalt unit was investigated in clinical conditions. MATERIALS AND METHODS All measurements were performed for 60Co γ-ray beams and...

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Journal: :Journal of Nuclear Medicine & Radiation Therapy 2016

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ژورنال: علوم پیراپزشکی و بهداشت نظامی 2017
فتاحی اصل, جعفر, فتاحی اصل, جواد, میردورقی, محمد,

Introduction: Ionizing radiations are one of the harmful factors in workplaces, so this study aimed to determine the radiation protection condition in radiology centers in educational hospitals of Ahwaz University of medical sciences. Methods and Materials: This research was a cross-sectional study that was performed among 25 active radiology rooms in 2013. First, an expert visits the radiolog...

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Journal: :iranian journal of radiation research 0
s. senthilkumar department of radiotherapy, madurai medical college and govt. rajaji hospital, maduari-625 020, india

background: the purpose of this study is to fabricate inexpensive in-house low cost homogeneous and heterogeneous human equivalent thorax phantom and assess the dose accuracy of the treatment planning systems (tps) calculated values for different lung treatment dosimetery. it is compared with thermoluminescent dosimeter (tld) measurement. materials and methods: homogeneous and heterogeneous tho...

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Journal: :journal of biomedical physics and engineering 0
a r farajollahi f bouzarjomehri m kiani

normal 0 false false false en-us x-none fa introduction: in radiation therapy centers across iran, protection of normal tissues is usually accomplished by either cerrobend or lead block shielding. in this study, the influence of these two shielding methods on central axis dose distribution of photon beam a cobalt unit was investigated in clinical conditions. materials and methods: all measureme...

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Journal: International Journal of Radiation Research 2014
S. Senthilkumar ,

Background: The purpose of this study is to fabricate inexpensive in-house low cost homogeneous and heterogeneous human equivalent thorax phantom and assess the dose accuracy of the Treatment Planning Systems (TPS) calculated values for different lung treatment dosimetery. It is compared with Thermoluminescent Dosimeter (TLD) measurement. Materials and Methods: Homogeneous and heterogeneous tho...

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