Results 241 to 250 of about 7,317,302 (267)
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TU‐EE‐A2‐04: Helical Tomotherapy Leakage Radiation Half and Tenth Value Layers in Concrete and Lead
Medical Physics, 2005Purpose: 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
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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
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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
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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
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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
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New Numerical Method for Solving Tenth Order Boundary Value Problems
Mathematics, 2018 In this paper, we implement reproducing kernel Hilbert space method to tenth order boundary value problems. These problems are important for mathematicians. Different techniques were applied to get approximate solutions of such problems.
Ali Akgül +2 more
exaly +2 more sources
Health Physics, 2007
The calculation of shielding barrier thicknesses for radiation therapy facilities according to the NCRP formalism is based on the use of broad beams (that is, the maximum possible field sizes). However, in practice, treatment fields used in radiation therapy are, on average, less than half the maximum size.
Adnan K, Jaradat, Peter J, Biggs
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The calculation of shielding barrier thicknesses for radiation therapy facilities according to the NCRP formalism is based on the use of broad beams (that is, the maximum possible field sizes). However, in practice, treatment fields used in radiation therapy are, on average, less than half the maximum size.
Adnan K, Jaradat, Peter J, Biggs
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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).
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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).
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Medical physics – the current status, problems, the way of development. Innovation technologies
Introduction. The article addresses the significant differences observed in the tenth-value layers (TVL) of leakage radiation attenuation in concrete for medical linear accelerators (linacs) between internationally recognized methodologies of the National Council on Radiation Protection and Measurements (NCRP) and the International Atomic Energy Agency
Dmytro BIELYKH +3 more
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Introduction. The article addresses the significant differences observed in the tenth-value layers (TVL) of leakage radiation attenuation in concrete for medical linear accelerators (linacs) between internationally recognized methodologies of the National Council on Radiation Protection and Measurements (NCRP) and the International Atomic Energy Agency
Dmytro BIELYKH +3 more
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Medical Physics, 2008
As different types of radionuclides (e.g., source) are introduced for clinical use in brachytherapy, the question is raised regarding whether a relatively simple method exists for the derivation of values of the half value layer (HVL) or the tenth value layer (TVL).
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As different types of radionuclides (e.g., source) are introduced for clinical use in brachytherapy, the question is raised regarding whether a relatively simple method exists for the derivation of values of the half value layer (HVL) or the tenth value layer (TVL).
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 ...
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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 ...
openaire +1 more source