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Mathematical estimation of half-value layer thicknesses. [PDF]
J Appl Clin Med Phys, 2021 Objective The objective of this article is to introduce a simplified and swift method to satisfactorily estimate the half‐value layers (HVL), quarter‐value layer (QVL), and tenth‐value layer (TVL) from the x‐ray spectra emitted by any diagnostic ...
Omoumi FH +5 more
europepmc +5 more sources
Nuclear Engineering and Technology, 2022 Half Value Layer calculations theoretically need prior specification of linear attenuation calculations, since the HVL value is derived by dividing ln(2) by the linear attenuation coefficient.
H.O. Tekin +3 more
doaj +4 more sources
Real-time dosimeter employed to evaluate the half-value layer in CT. [PDF]
Phys Med Biol, 2014 Half-value layer (HVL) measurements on commercial whole body computer tomography (CT) scanners require serial measurements and, in many institutions, the presence of a service engineer.
McKenney SE +6 more
europepmc +7 more sources
[Precision of half-value layer measurement on mammography].
Japanese Journal of Radiological Technology, 2011 The half-value layer (HVL) is an important index of the image quality or radiation risk in mammography. Radiation risk of the breast tissue is evaluated with the average glandular dose. The HVL index is indispensable for the average glandular dose computations.
R. Ishii +4 more
semanticscholar +4 more sources
Half-value layer measurement: simple process method using radiochromic film [PDF]
Australasian Physics & Engineering Sciences in Medicine, 2009 Although the half-value layer (HVL) is one of the important parameters for QA and QC, constant monitoring has not been performed because the measurements using an ionization chamber (IC) are time-consuming and complicated. To solve these problems, the use of radiochromic film (GAFCHROMIC XR TYPE R: GAF-R) with step-shaped aluminum (Al) filters ...
T. Gotanda +8 more
semanticscholar +3 more sources
A simple method for evaluation of half-value layer variation in CT equipment
Physics in Medicine and Biology, 2006 Tandem systems, each formed by a pencil ionization chamber with and without a specific covering, were developed and tested in standard radiation beams. These systems were designed to be used in computed tomography radiation beams, where the half-value layer (HVL) determination is not an easy task.
A. F. Maia, L. Caldas
semanticscholar +3 more sources
Determination of the Tenth and Half Value Layer Thickness of Concretes with Different Densities
Acta Physica Polonica A, 2016 Half value layer (HVL) is the most frequently used quantitative factor for describing both the penetrating ability of specific radiations and the penetration through specific objects.
A. Akkaş
semanticscholar +2 more sources
Determination of Some Heavyweight Aggregate Half Value Layer Thickness Used for Radiation Shielding
Acta Physica Polonica A, 2012 A radiation dose above the maximum permissible limit is very dangerous for human being. In radiation shielding, absorbent materials’ properties must be well known. Heavyweight concrete is the most widely used in the world for this aim.
I. Akkurt +5 more
semanticscholar +4 more sources
Investigation of gamma radiation shielding features for modified structural materials for nuclear energy and nuclear medicine [PDF]
Nuclear Technology and Radiation Protection, 2023 In this paper, shielding characteristics of three concrete samples with different B4C,Fe3O4,and BaSO4 contents were examined by determining their theoretical and experimental mass attenuation coefficients at photon energies of 15 MeV.
Zaripova Yuliya +4 more
doaj +1 more source