Results 231 to 240 of about 155,797 (260)
Comparative pathogenicity of very virulent and novel variant infectious bursal disease virus Egyptian strains in chickens. [PDF]
Virol JIbrahim M +5 more
europepmc +1 more source
Effect of chlorhexidine vs. saline for oral care on oral microbiota and prognosis of elderly mechanically ventilated patients in the intensive care unit: a single-center, single-blind, randomized controlled trial. [PDF]
BMC Oral HealthQiu C +6 more
europepmc +1 more source
A Measure of Voluntariness in Migration
Journal of Social Philosophy, EarlyView.
Ilkin Huseynli
wiley +1 more source
Health Physics, 2007 Tenth-value-layers (TVLs) for a 6 MV stereotactic radiosurgery (SRS) x-ray beam have been computed using Monte Carlo methods for radiation transport simulation. The first and equilibrium TVLs were determined in the three most common building materials used in radiation therapy vault construction: ordinary concrete, lead, and steel (iron).
James Rodgers
openaire +3 more sources
Medical Physics, 2015 Purpose: Use of high density concrete for radiation shielding is increasing, trading cost for space savings associated with the reduced tenth value layer (TVL). Precise information on the attenuation properties of high-density concretes is not readily present in the literature.
S Tanny +4 more
openaire +2 more sources
TU‐EE‐A2‐04: Helical Tomotherapy Leakage Radiation Half and Tenth Value Layers in Concrete and Lead
Medical Physics, 2005 Purpose: According to NCRP Report 51, if the leakage TVL is not measured, the primary radiation TVL should be used for the shielding design. Varian measured its own 90° leakage TVL in 1995. To determine which TVL value is most suitable for Hi‐Art II Tomotherapy, its leakage radiation half and tenth value layer in concrete and lead are measured. Methods
M Mirzasadeghi +6 more
openaire +2 more sources
Medical Physics, 2008 Purpose: The objectives of this study were to measure the leakage radiation levels surrounding the tomotherapy machine and to determine the tenth value layers (TVL) for concrete. Method and Materials: A custom designed shield was fabricated with Cerrobend to shield a 1000cc spherical ionization‐chamber used in these measurements.
S Goddu +7 more
openaire +2 more sources
Medical Physics, 2006 Treatment room shielding design depends on barrier attenuation data. It is common practice to use tenth‐value‐layers (TVLs) or related quantities measured for a given beam quality and shielding material. This investigation has applied Monte Carlo simulation to accurately determine the first, second and third TVLs for the three most common building ...
Joseph J. Rodgers
openaire +2 more sources
Medical Physics, 2009 Purpose:Several factors including radionuclide purity influence the photon energy spectra from sealed brachytherapy sources. The existence of impurities and trace elements in radioactive materials as well as the substrate and encapsulation may not only alter the spectrum at a given time but also cause change in the spectra as a function of time.
Ning J, Yue +4 more
openaire +3 more sources
Medical Physics, 2009 Purpose: To investigate the impacts of spectral time dependence of brachytherapy source on shielding requirements and the Nth value layers NthVL). Method and Materials: The photon energy spectrum of brachytherapy sources is influenced by several factors including radionuclide purity.
N Yue +4 more
openaire +2 more sources