نتایج جستجو برای: radiation intensity

تعداد نتایج: 407858  

ژورنال: سنجش و ایمنی پرتو 2013

According to radiation protection regulations, microwave radiation intensity should not exceed general public exposure limit defined in "Iranian Standard-Non ionizing radiation-exposure limits". Based on this standard, exposure limit for microwave ovens, which work at 2450 MHz, is 1mW/cm2. By implementing such standard, about 575 imported ovens, including different models and brands w...

Alieh Alipoor Reza Fardid,

Introduction: Coronary angiography is a Diagnostic-Therapeutic method involving ionizing radiation. This method causes to DNA damage with form double stranded breaks which is followed by the phosphorylation of the histone, H2AX. H2AX is a key factor in the repair process of damaged DNA which will accumulate to damage sites. In human cells, H2AX constitutes about 10% of the H2A ...

Journal: :iranian journal of radiation research 0
f. bouzarjomehri department of medical physics, shahid sadoughi university of medical sciences, yazd, iran v. tsapaki department of medical physics, konstantopoulio hospital, nea ionia, athens, greece

background: ultraviolet (uv) radiation is divided into three regions: uva, uvb, and uvc. both the quality and quantity of solar uv radiation vary with various factors including the elevation of the sun above the horizon, as well as absorption and scattering of uv photons by molecules in the atmosphere, notably ozone and clouds. it is clear that whereas a moderate amount of uv exposure is benefi...

Journal: :Cancer radiotherapie : journal de la Societe francaise de radiotherapie oncologique 2002
William W Chou Dev R Puri Nancy Y Lee

Radiotherapy planning studies have confirmed dosimetric advantages of intensity-modulated radiation therapy over conventional and conformal radiation therapy. Utilization of intensity-modulated radiation therapy is ideal in head and neck cancer patients. Critical structures can be spared due to sharp dose gradients and limited organ motion with correct immobilization. Initial clinical results h...

1993
Masao Kume Pradeep K. Khosla

In this paper we describe the development of a robotic system that uses Mercuric Iodide (HgI2) sensors to create a map of radiation intensity in the environment. The sensors are mounted at the end-effector of a PUMA 560 manipulator. Data from these sensors is used to compute the radiation intensity. A control system is developed that moves the endeffector along constant intensity contours. The ...

2015
Masao Kume Pradeep Khosla Pradeep K. Khosla

In this paper we describe the development of a robotic system that uses Mercuric Iodide (HgI2) sensors to create a map of radiation intensity in the environment. The sensors are mounted at the end-effector of a PUMA 560 manipulator. Data from these sensors is used to compute the radiation intensity. A control system is developed that moves the endeffector along constant intensity contours. The ...

Journal: :AJR. American journal of roentgenology 1985
R G Ramsey C E Zacharias

Magnetic resonance (MR) imaging of the spine after radiation treatment in four patients demonstrated well defined areas of increased signal intensity in the vertebral bodies on short or T1-weighted sequences. Radiation doses of 4000-5790 rad (40-57.9 Gy) were administered to the mediastinum, rectum, and spine. The interval between radiation treatment and MR imaging was 2 months to 10 years. The...

ژورنال: سنجش و ایمنی پرتو 2014

In this paper, the parametric X-ray radiation (PXR) spectral-angular distribution in the framework of the dynamical and kinematical diffraction theory was investigated in details. It is shown that dynamical diffraction effects can be increase with intensity of radiation, increase threshold energy saturation and the change in polarization of the radiation. Therefore, some unique properties of P...

2010
H. D. Thomsen J. Esberg K. K. Andersen M. D. Lund H. Knudsen U. I. Uggerhøj P. Sona A. Mangiarotti T. J. Ketel A. Dizdar S. Ballestrero S. H. Connell

Experimental results for the radiation emission from ultrarelativistic electrons in targets of 0.03%–5% radiation length is presented. For the thinnest targets, the radiation emission is in accordance with the Bethe-Heitler formulation of bremsstrahlung, the target acting as a single scatterer. In this regime, the radiation intensity is proportional to the thickness. As the thickness increases,...

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