introduction quality control (qc) techniques are used in monitoring and maintenance of the components of an x-ray system. qc of radiology devices plays a significant role in reduction of medication dose and optimization of image quality. this study aimed to conduct qc tests on randomly selected radiology devices, installed in diagnostic imaging departments of iran. materials and methods in tota...

PURPOSE The accurate prediction of x-ray spectra under typical conditions encountered in clinical x-ray examination procedures and the assessment of factors influencing them has been a longstanding goal of the diagnostic radiology and medical physics communities. In this work, the influence of anode surface roughness on diagnostic x-ray spectra is evaluated using MCNP4C-based Monte Carlo simula...

BACKGROUND Disease progression in the absence of therapy varies significantly in HIV-1 infected individuals. Both viral and host cellular molecules are implicated; however, the exact role of these factors and/or the mechanism involved remains elusive. To understand how microRNAs (miRNAs), which are regulators of transcription and translation, influence host cellular gene expression (mRNA) durin...

Radiation shield ing aprons are needed by radiation workers to minimize exposure the body. The apron s at present use fabric-coated lead plates which heavy and rigid materials therefore not comfortable use. Polymer from cassava starch glycerin with addition of Pb- nitrate filler 0 %, 2 4 6 % have been synthesized. Mixtures for synthesizing polymer composites were heated using a magnetic stirrer...

This study investigates the dosimetric dependence of the dimension of a lead (Pb) layer for shielding using clinical electron beams with different energies. Monte Carlo simulations were used to generate phase space files of the 4, 9 and 16 MeV electron beams produced by a Varian 21 EX linear accelerator using the EGSnrc-based BEAMnrc code, and validated by measurements using films. Pb layers wi...

In the current study shielding parameters, mass and linear attenuation coefficients, Half Value Layer (HVL), Tenth (TVL) Mean Free Path (MFP) values were calculated theoretically used calculation software Phy-X/PSD for superconducting lead free SnIn alloy solder system that composition chosen from binary phase diagram of PbSn which has been mostly in micro electric cryogenic applications decade...

Gamma radiation shielding features for three series of binary alloys identified as (Pb–Sn), (Pb–Zn), and (Zn–Sn) have been investigated. The mass attenuation coefficients (?/?) the selected were simulated using MCNP-5 code in energy range between 0.01 15 MeV. Moreover, values computed WinXCOM database same to validate simulation results. Results reveal a good agreement values. half value layer ...

In aquaculture, new production technologies are under development and testing. One promising type of technology is the closed floating cage. Egget® one these newly developed technologies, which egg-shaped vertically floating. challenges to determine hydrodynamic loads. Therefore, this study focuses on estimating resistance coefficient for steady flow with various velocities Reynolds numbers a s...

In this study, the gamma ray shielding properties of shields prepared from polyvinyl alcohol as a base material reinforced with barium sulfate nanoparticles at different reinforcement ratios (5,15,25,35,45 %) and thickness 1 cm were studied. To determine acceptability these for use in protection, some parameters including linear attenuation coefficient (μ), mean free path (λ), half value layer ...

Various composites containing glucose are widely used in cement production. Glucose-containing materials the production of various types cements due to their advantageous properties such as being light, economical and easily accessible. In this study, radiation shielding parameters C8H13O5N (chitin) mixture with Pb doped at percentages (5, 10, 20%) linear attenuation coefficients (LAC), mass (M...