This study aims to perform multidirectional characterizations on nuclear shielding efficiencies some bismuth-based glasses. Accordingly, the γattenuation coefficients for xBi2O3-(75-x)B2O3–25Li2O (x = 0, 10, 20, 30, 40, 50, 60 70 mol%) were widely evaluated using simulations and theoretical methods. Linear attenuation coefficient (LAC) of glasses was obtained by Monte Carlo general-purpose simu...

The ability to carry over models and testbenches from one level of abstraction to another is becoming increasingly important to the design and verification of system designs. This capability delivers the benefits of reuse with a scalable methodology. It therefore enables engineering teams to leverage the particular strengths of different modeling domains. For example, take the behavioral testbe...

Rayleigh-wave phase velocity of a layered earth model is a function of frequency and four groups of earth properties: Pwave velocity, S-wave velocity (Vs), density, and thickness of layers. Analysis of the Jacobian matrix (or the difference method) provides a measure of dispersion curve sensitivity to earth properties. Vs is the dominant influence for the fundamental mode (Xia et al., 1999) and...

This study provides the authors' experience along with dosimetric data from the commissioning of two Sensus SRT-100 50-100 kV X-ray units. Data collected during the commissioning process included: a) HVL, b) output (dose rate), c) applicator cone factors, and d) percentage depth dose. A Farmer-type chamber (PTW-N23333), and a thin-window parallel plate ion chamber (PTW-N23342) were used for dos...

In the present work, twelve inorganic thermoluminescence dosimeteric (TLD) materials doped with some rare earth elements (LiF:Sm, LiBaP 2 O 7 :Eu, CaCO 3 CaSO 4 :Dy, SrSO :Sm, CdSO BaSO Li B MgB :Gd, Al MgAl :Ce and LiCaAlF 6 :Eu) three organic TLD (C H NO , C 8 BaO ) were selected for comparative analysis on basis of different photon sensing parameters. About nine parameters viz. mass attenuat...

We have attempted to develop the gamma radiation shielding abilities of newly prepared epoxy composites by introducing ZrO2. The parameters are experimentally reported below. experimental setup included an HPGe detector and different radioactive point sources which emitted photons with energies 0.06, 0.662, 1.173, 1.333 MeV. were examined in context linear attenuation coefficient (LAC), half-va...

Few studies have addressed the relation between serum vitamin A level and HIV disease progression. Thirty HIV-infected women in Rwanda were studied over a time span of 26 to 99 months. Fourteen subjects seroconverted and died of HIV-related disease at a mean of 44 months (range, 26-69 months) after their first HIV-positive test and were termed "rapid progressors," (RPs). A comparison group of 1...

This study aims to the radiation shielding features of TeO2–WO3–RO systems (where RO =PbO and Bi2O3). The glasses were theoretically evaluated by using simulation code Phy–X/PSD. Four TeO2–WO3–Bi2O3 three TeO2–WO3–PbO tested in this study. linear attenuation coefficient (LAC), mass (MAC), effective atomic number (Zeff), half value layer (HVL), tenth (TVL), mean free path (MFP) calculated analyz...

Background: High density concrete is extensively used for efficient radiation attenuation in radiotherapy rooms and nuclear reactors. Over the past eight years, some efficient galena-based concrete samples for shielding X or gamma rays was produced. The goal of this study was to produce a novel high density concrete against neutron and photon radiations using tourmaline and galena. Materials an...