نتایج جستجو برای: biological effects radiation

تعداد نتایج: 2135498  

2016
Alberto Del Guerra

s from the 1 European Congress of Medical Physics September 1–4, 2016 Eugenides Foundation, Athens, Greece

Journal: :Australian dental journal 2012
Stuart C White S M Mallya

Diagnostic imaging is an indispensable part of contemporary medical and dental practice. Over the last few decades there has been a dramatic increase in the use of ionizing radiation for diagnostic imaging. The carcinogenic effects of high-dose exposure are well known. Does diagnostic radiation rarely cause cancer? We don't know but we should act as if it does. Accordingly, dentists should sele...

2006
Artem L. Ponomarev Francis A. Cucinotta

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Introdution: A careful study of the physical and biological properties of helium ion radiation on the various cell lines is essential for the treatment planning. In this study, the biological response of several different cell lines has been investigated in 4He ions. Methods: Physical dose profiles and Linear Energy Transfer (LET) calculations were performed using the Monte Carlo Geant4 code. ...

Journal: :journal of biomedical physics and engineering 0
d shahbazi-gahrouei dept. of medical physics, school of medicine, isfahan university of medical sciences, isfahan, iran; [email protected] b hashmi-beni department of anatomical sciences, school of medicine, isfahan university of medical sciences, isfahan, iran z ahmadi msc of medical physics, dept. of medical physics, school of medicine, isfahan university of medical sciences, isfahan, iran

background: as the use of mobile phones is increasing, public concern about the harmful effects of radiation emitted by these devices is also growing. in addition, protection questions and biological effects are among growing concerns which have remained largely unanswered. stem cells are useful models to assess the effects of radiofrequency electromagnetic fields (rf-emf) on other cell lines. ...

Journal: :iranian journal of radiation research 0
s.r. mahdavi department of medical physics, babol university of medical sciences, babol, iran a.r. nikoofar department of radiation oncology, iran university of medical sciences, tehran, iran h.r. mirzaee department of radiation oncology, shahid beheshti university of medical sciences, tehran, iran b. mofid department of radiation oncology, shahid beheshti university of medical sciences, tehran, iran r. mohammadi department of internal medicine, zanjan university of medical sciences, zanjan, iran

background: study of vascular and its secretory profile changes is an important issue in pathogenesis of radiation myelopathy. this paper reports the prostacyclin concentration changes after low-moderate doses of x-irradiation within a short period of time. materials and methods: cervical cords of wistar rats were irradiated to doses of 0.5, 1, 2, 4 and 6 gy x-rays. after 24 hours, 2 and 13 wee...

Journal: :Pathophysiology : the official journal of the International Society for Pathophysiology 2009
Carl Blackman

Many national and international exposure standards for maximum radiation exposure from the use of cell phone and other similar portable devices are ultimately based on the production of heat particularly in regions of the head, that is, thermal effects (TE). The recent elevation in some countries of the allowable exposure, that is, averaging the exposure that occurs in a 6min period over 10g of...

2009
Wei Han Kwan Ngok Yu

Ionizing radiation is encountered in our natural environment and is also generated and used by mankind, e.g., for medical uses. A better understanding of the biological effects of ionizing radiation will lead to better use of and better protection from radiation. In this chapter, the response of cells to radiation will be described and discussed. Some basic concepts of ionizing radiation will b...

2010
Feng Yang Katrina M. Waters John H. Miller Marina A. Gritsenko Rui Zhao Xiuxia Du Eric A. Livesay Samuel O. Purvine Matthew E. Monroe Yingchun Wang David G. Camp Richard D. Smith David L. Stenoien

BACKGROUND High doses of ionizing radiation result in biological damage; however, the precise relationships between long-term health effects, including cancer, and low-dose exposures remain poorly understood and are currently extrapolated using high-dose exposure data. Identifying the signaling pathways and individual proteins affected at the post-translational level by radiation should shed va...

Journal: :Anticancer research 2016
Michael F Holick

Humans evolved in sunlight and had depended on sunlight for its life giving properties that was appreciated by our early ancestors. However, for more than 40 years the lay press and various medical and dermatology associations have denounced sun exposure because of its association with increased risk for skin cancer. The goal of this review is to put into perspective the many health benefits th...

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