نتایج جستجو برای: dose rate and radiation source
تعداد نتایج: 17000624 فیلتر نتایج به سال:
Comparison of Indoor and Outdoor Dose Rates from Environmental Gamma Radiation in Kurdistan Province
Background & Aims: Studying about background radiation is important because human beings are continuously exposed to these radiations which leave energy in tissues and the transferred energy leads to undesirable biologic effects. The level of background radiation differs in indoor and outdoor places. Since, people spend more time indoors, in this research environmental gamma dose rate for indoo...
background: the number of interventional cardiology procedures performed has increased rapidly over the past years. while these procedures help physicians avoid using highly complicated invasive methods, it usually leads to high levels of exposure to ionizing radiation of both patients and cardiologist. the dose received by the cardiologist during interventional cardiology procedures is determi...
The coastal area of Ramsar in northern of Iran located in the province of Mazandaran has been known as the highest levels of natural radiation background in the world. The background radiation is mainly due to the presence of radioactive isotopes of the radium element and its decay products, which is brought to the surface by hot springs. In this study, the indoor gamma dose rate in Ramsar wa...
employees always concern about losing their job , or in other word , losing their income resources. for this purpose, every government requires strong system for covering these concerns. the unemployment insurance (ui) program’s can be used for achieving this goal. in this thesis, we price ui based on the insurance history of employee and the duration of being unemployed. we use the weibull dis...
calculations and simulation of the designed shield for bonab industrial irradiation unit has been investigated in this work. this irradiator is panoramic wet source storage which is used to irradiation of medical equipment, some kinds of food & healthcare products, spices, … in order to sterilization and increasing of durability. irradiation is performed in irradiation room using emitted photon...
The space environment consists mainly of high-energy charged particles, such as protons, electrons and heavy ions. They are originating from several sources including galactic cosmic radiation, solar flares and van Allen belts. High energy electromagnetic radiation and neutrons have also been measured on spacecraft. Although shielding can reduce the effect of space radiation it cannot be elimin...
introduction: the relation between patient body mass index (bmi) and the external dose rate of thyroid cancer patients treated with 131i has been investigated. methods: a total of 183 patients treated with 131i were selected randomly and divided according to their administrated activity into three groups: 3.7gbq, 5.5gbq and 7.4gbq. they were also stratified into three groups according to their...
introduction: radioactive materials deliver internal radiation dose to patients in nuclear medicine. manual internal radiation dose assessment is a complicated method. introduction of a simple dose calculation software is the main goal of the present study. methods: using the best current data in internal dose calculation (s-factors) recommended by icrp and by considering other technical metho...
Samples from two type of polyethylene, with low and high density, had been subjected to three different initial processing. The samples were heated to 170 oC and then cooled by different cooling rating in air, in mold (10 oC/min cooling rate) and in 0.0 oC water. Following this step, each sample irradiated by 10 MeV electron beam. The gel content of the samples, which is a measure of interchain...
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