نتایج جستجو برای: radiation shielding

تعداد نتایج: 245445  

Journal: :iranian journal of medical physics 0
rezvan khaldari medical physics department, medical school, tabriz university of medical sciences, tabriz, iran asghar mesbahi medical physics department, medical school, tabriz university of medical sciences, tabriz, iran. umit kara suleyman demirel university

introduction: globally, the need for radiotherapy as a part of cancer management increases every year. thus, the shielding for megavoltage radiotherapy rooms is of great importance. materials and methods: in the present study, 14 types of developed high-density concrete with densities ranging from 2.45 to 5.11 were simulated by using monte carlo method. the linear attenuation coefficient and th...

2016
Seon Chil Kim Jeong Ryeol Choi Byeong Kyou Jeon

The purpose of this paper is to develop a lightweight apron that will be used for shielding low intensity radiation in medical imaging radiography room and to apply it to a custom-made effective shielding. The quality of existing aprons made for protecting our bodies from direct radiation are improved so that they are suitable for scattered X-rays. Textiles that prevent bodies from radiation ar...

Journal: :journal of biomedical physics and engineering 0
m. r. aghamiri associate professor of medical physics, medical physics & engineering department, school of medicine, shahid beheshti university of medical sciences, tehran, iran s. m. j. mortazavi professor of medical physics, medical physics & engineering department, school of medicine, shiraz university of medical sciences, shiraz, iran m. tayebi master student of radiobiology and radiation protection, shahid beheshti university of medical sciences, tehran, iran m. a. mosleh-shirazi assistant professor of medical physics, radiotherapy department, school of medicine, shiraz university of medical sciences, shiraz, iran h. baharvand assistant professor of polymer chemistry, iran polymer institute, tehran, iran a. tavakkoli-golpayegani assistant professor of medical engineering (biomechanics), medical physics & engineering department, school of medicine, shiraz university of medical sciences, shiraz, iran

background: lead-based radiation shields are widely used in radiology departments to protect both workers and patients from any unnecessary exposure to ionizing radiation. recently there has been a great deal of concern expressed about the toxicity of lead. human lead toxicity is well documented. in that light, production of environmentally-friendly lead-free radiation shields with less weight ...

2010

Taiwan Photon Source (TPS) will be a 3 GeV light source with a circumference of 518.4 m and operating fully at 400 mA in top-up mode, aiming to provide synchrotron light with extremely high brilliance and low emittance. Significant amount of radiation will be produced due to the loss of such high-energy electrons and result in radiation safety concerns. The design objective of radiation safety ...

2014
Ajit D. Kelkar

Radiation shielding is an obstacle in long duration space exploration. Boron Nitride Nanotubes (BNNTs) have attracted attention as an additive to radiation shielding material due to B’s large neutron capture cross section. The B has an effective neutron capture cross section suitable for low energy neutrons ranging from 10 to 10 eV and hydrogen is effective at slowing down high energy neutrons....

Journal: :iranian journal of radiation research 0
f. bouzarjomehri department of medical physics, shahid sadoghi university of medical sciences, yazd, iran t. bayat department of medical physics, centre for education and training, zanjan, iran m.h. dashti r department of physiology, shahid sadoghi university of medical sciences, yazd, iran j. ghisari department of physics, yazd university, yazd, iran n. abdoli department of architecture, yazd university, yazd, iran

abstract  introduction: recently uses of medium and high energy x-rays has been increased in iran and radiotherapy centers along with a variety of accelerators have been installed in some provinces. in the other hand there is no sufficient skill in designing and making radiotherapy treatment rooms. this study was conducted to evaluate the efficacy of different mixtures of barite concrete for sh...

2017
Amir Bahadori Edward Semones Michael Ewert James Broyan Steven Walker

Passive radiation shielding is one strategy to mitigate the problem of space radiation exposure. While space vehicles are constructed largely of aluminum, polyethylene has been demonstrated to have superior shielding characteristics for both galactic cosmic rays and solar particle events due to the high hydrogen content. A method to calculate the shielding effectiveness of a material relative t...

Journal: :AJNR. American journal of neuroradiology 2001
K D Hopper J D Neuman S H King A R Kunselman

BACKGROUND AND PURPOSE The lens of the eye is sensitive to radiation. Children undergoing CT of the head and patients undergoing repeated CT scanning of the head are vulnerable to this complication. The purpose of this study was to test the ability of a heavy metal, bismuth, in reducing radiation to the lens of the eye during routine cranial CT. METHODS Both phantom and human studies were don...

M. Danaeefar, M. Ebrahimzadeh, P. Hajipour, S. Radiom,

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...

2009
Norah Bate

Current forms of radiation shielding fail to adequately protect either equipment or personnel during extended space travel beyond the Van Allen radiation belts. Radiation such as galactic cosmic radiation, neutrons, and high energy electromagnetic radiation is of great concern and must be taken into account in the planning of any future mission. In light of this, it is necessary to produce new ...

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