نتایج جستجو برای: rays

تعداد نتایج: 44458  

Journal: :iranian journal of allergy, asthma and immunology 0
ebrahim torkabadi amina kariminia farideh zakeri

angiocardiography is an x-ray examination of the blood vessels or chambers of the heart. cardiologists and staff members applying this procedure are exposed to high levels of scattered radiation. in our previous study the incidence of unstable chromosomal aberrations and cytokinesis-blocked micronuclei were found to be significantly higher in exposed individuals than the age and sex matched con...

Journal: :iranian journal of astronomy and astrophysics 2014
davoud purmohammad safoora tanbakooei

the dependence of the lateral distribution of cherenkov light in simulated extensive air showers to the energy and the mass of the primary cosmic rays has been studied. it has been shown that a previous claim about mass independent proportionality of shower energy to the total cherenkov photon number is not valid in energies below eeas ~ 1014 ev. we have found that the core distance of the so c...

Journal: :journal of plant molecular breeding 2013
mozhgan abtahi ahmad arzani

mutation induction is considered as an effective way to enrich plant genetic variation, particularly fortraits with a very low level of genetic variation. this research was conducted to assess genetic variationinduced by gamma radiation in m2 and m3 mutant lines of canola (brassica napus l.) by ssr and morphologicalcharacteristics and to identify useful mutants in terms of agronomic traits. six...

Journal: :iranian journal of radiation research 0
m. amiri department of nuclear medicine, babol university of medical sciences, babol, iran r. abdi department of radiology, mazandaran university of medical sciences, sari, iran a. shabestani monfared department of medical physics, babol university of medical sciences, babol, iran

background: the effect of natural background radiation on health is still controversial. however, it is clear that it depends on the dose received by the population. the estimation of external natural background gamma rays received by the population of caspian coastal provinces in the northern part of iran was the main goal of this study. materials and methods: gamma rays was measured using cal...

Journal: :Journal of the Society of Materials Science, Japan 2018

Journal: :the archives of bone and joint surgery 0
andrewj. miller department of orthopaedics, thomas jefferson university hospital, philadelphia, usa christopher jones department of orthopaedics, thomas jefferson university hospital, philadelphia, usa frederick liss department of orthopaedics, thomas jefferson university hospital, philadelphia, usa jack abboudi department of orthopaedics, thomas jefferson university hospital, philadelphia, usa william kirkpatrick department of orthopaedics, thomas jefferson university hospital, philadelphia, usa pedro beredjiklian department of orthopaedics, thomas jefferson university hospital, philadelphia, usa

object: the gold standard for evaluating bone mineral density is dual energy x-ray absorptiometry (dexa).  prior studies have shown poor reliability using analog wrist x-rays in diagnosing osteoporosis. our goal was to investigate if there was improved diagnostic value to visual assessment of digital hand x-rays in osteoporosis screening. we hypothesized that similar to analog counterparts, dig...

Journal: :medical journal of islamic republic of iran 0
aram rostami department of medical physics, faculty of medicine, iran university of medical sciences, tehran, iran.سازمان اصلی تایید شده: دانشگاه علوم پزشکی ایران (iran university of medical sciences) seyed akbar moosavi department of lab sciences, school of allied medicine, iran university of medical sciences, tehran, iran.سازمان اصلی تایید شده: دانشگاه علوم پزشکی ایران (iran university of medical sciences) vahid changizi department of technology of radiology and radiotherapy, school of allied medicine, tehran university of medical sciences, tehran, iran.سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (tehran university of medical sciences) ali abbasian ardakani department of medical physics, faculty of medicine, iran university of medical sciences, tehran, iran.سازمان اصلی تایید شده: دانشگاه علوم پزشکی ایران (iran university of medical sciences)

background: critical macromolecules of cells such as dna are in exposure to damage of free radicals that induced from the interaction of ionizing radiation with biological systems. selenium and vitamin-e are natural compounds that have been shown to be a direct free radical scavenger. the aim of this study was to investigate the radioprotective effect of selenium and vitamin-e separately and sy...

Journal: :iranian journal of radiation research 0
m. shahidi department of biochemistry and biophysics, mazandaran university of medical sciences, sari, iran s. mozdarani hazrat e maryam fertility center, nimeh shaban hospital, sari, iran sh. shammas department of obstetrics and gynecology, alfred krupp hospital, essen, germany

background: quantification of radiation-induced apoptosis in peripheral blood lymphocytes (pbls) has been proposed as a possible screening test for cancer-prone individuals and also for the prediction of normal tissue responses after radiotherapy. materials and methods: the neutral version of the comet assay (single-cell gel electrophoresis) was used 24, 48, 72 hours after irradiation with 8 gy...

Journal: :iranian journal of radiation research 0
sh. shirani school of paramedicine, shahid beheshti university of medical sciences, tehran, iran h. mozdarani department of medical genetics, faculty of medical sciences, tarbiat modares university, tehran, iran a. mahmoodzadeh novin medical radiation institute, tehran, iran m. salimi department of medical genetics, medical biotechnology institute, national institute of genetic engineering and biotechnology, tehran, iran

background: radio-adaptive response and bystander effects are known phenomena occurring in cells following exposure to ionizing radiation (ir). in this study we examined possible radio-adaptation of lymphocytes following bystander effects induced by cho-k1 cells. materials and methods: whole blood and cho-k1 cells were cultured in rpmi-1640 complete medium. cells were separately irradiated with...

Journal: :iranian journal of radiation research 0
h. ghiasi medical physics department, medical school, tabriz university of medical sciences, tabriz, iran a. mesbahi radiation oncology department, imam hospital, daneshgah street, tabriz, iran

background: the characteristics of secondary neutrons in a high energy radiation therapy room were studied using the mcnpx monte carlo (mc) code. materials and methods: two mc models including a model with full description of head components and a simplified model used in previous studies were implemented for mc simulations. results: results showed 4-53% difference between full and with the sim...

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