Results 31 to 40 of about 9,665,764 (300)

Methodology study for determining the half-value layer using the Monte Carlo code PHITS

Brazilian Journal of Radiation Sciences
For most purposes, the quality of a beam can be specified in terms of the half-value layer (HVL), which is the thickness of material required to reduce the air kerma  to half, at one meter from the source, from a unidirectional beam of infinitesimal ...
Ronald Soares, Marco Aurélio Lacerda
doaj   +1 more source

Reference dosimetry at the Australian Synchrotron's imaging and medical beamline using free-air ionization chamber measurements and theoretical predictions of air kerma rate and half value layer.

Medical Physics (Lancaster), 2013
PURPOSE Novel, preclinical radiotherapy modalities are being developed at synchrotrons around the world, most notably stereotactic synchrotron radiation therapy and microbeam radiotherapy at the European Synchrotron Radiation Facility in Grenoble, France.
J. Crosbie, P. Rogers, A. Stevenson, C. Hall, J. Lye, T. Nordström, S. Midgley, R. Lewis   +7 more
semanticscholar   +1 more source

Comparison of X-Ray Attenuation Performance, Antimicrobial Properties, and Cytotoxicity of Silicone-Based Matrices Containing Bi2O3, PbO, or Bi2O3/PbO Nanoparticles [PDF]

Journal of Biomedical Physics and Engineering
Background: Application of the nanomaterials to preparing X-ray shields and successfully treating multiresistant microorganisms has attracted great attention in modern life.Objective: This study aimed to prepare flexible silicone-based matrices ...
Baharak Divband, Zahraa Haleem Al-qaim, Falah H. Hussein, Davood Khezerloo, Nahideh Gharehaghaji   +4 more
doaj   +1 more source

Correction of the Contribution of Scattered Photon Radiation to the Ionization Chamber Readings During X-Ray Radiation Quality Assessment

Приборы и методы измерений, 2022
Reduction of the systematic error when determining the characteristics of the reference X-ray radiation fields is an essential task according to the ISO 4037-1:2019 standard.
A. A. Zaharadniuk, K. G. Senkovsky, R. V. Lukashevich   +2 more
doaj   +1 more source

Fast neutrons and gamma rays shielding properties for some nylon composite [PDF]

E3S Web of Conferences
In this study, The removal parameters of macroscopic fast neutron cross-section, linear gamma ray attenuation, mean free path, and half-value layer (half-value thickness) were calculated for a polymer composite containing nylon 6 as a base material and ...
Kareem Dawood Salwah, Ghali Ishnayyin Hadeel, Fadhil Mkhaiber Ahmed, Hatim Naseef Hadia   +3 more
doaj   +1 more source

Artificial semi-rigid tissue sensitized with natural pigments: Effect of photon radiations

Journal of Pharmacy and Bioallied Sciences, 2011
Background: A new approach for evaluating the optical penetration depth and testing its validity with Monte Carlo simulations and Kubelka-Munk theory is used for artificial semi-rigid tissue sensitized with natural pigments.
Adnan Jaradat, M-Ali H Al-Akhras, G Makhadmeh, K Aljarrah, A Al-omari, Z Ababneh, Majed M Masadeh, H M Al-Khateeb, B A Albiss, M Alshorman   +9 more
doaj   +1 more source

A study on the mean free path and half value layer at various alloys for different photon energies

Journal of X-Ray Science and Technology, 2011
The mean free path (mfp) and half value layer ( $x_{1 / 2}$ ) values of binary and ternary alloys consist of 3d transition metals have been have been calculated at photon energies 22.1, 25.0, 59.5 and 88.0 keV.
I. Han, M. Aygun, L. Demir, E. Narmanlı
semanticscholar   +1 more source

Membrane composition and thermodynamic identity as boundaries of life for synthetic cell research

FEBS Letters, EarlyView.
What makes a cell a cell? The boundary of a living cell is not just a wall. Read as a Markov blanket, the membrane separates internal from external states, generating identity and non‐equilibrium order. Can this identity be rebuilt from scratch in a synthetic cell?
Caterina Presutti, Bert Poolman
wiley   +1 more source

Measurement and Research of Intrinsic Filtering of X-Ray Optical Machine

Journal of Isotopes, 2021
The thickness of the inherent filter layer is one of the important performance parameters of the X-ray reference radiation device, and it needs to be quantitatively measured. This research is based on the new version of ISO 4037-1 standard specification,
HANG Zhongbin;LIU Chuanfeng;LIU Yuntao;WEI Kexin;SONG Mingzhe;WANG Hongyu
doaj   +1 more source

The role of miR‐335‐5p in the redifferentiation of BRAF p.V600E thyroid cancers

Molecular Oncology, EarlyView.
The BRAF p.V600E mutation promotes thyroid cancer dedifferentiation and radioiodine resistance. Using a network approach, we identified miR‐335‐5p as a key regulator of BRAF‐mutated thyroid tumors. Restoring miR‐335‐5p increased thyroid‐specific gene expression and iodine uptake in cells and organoids.
Valeria Pecce, Simone Bini, Marialuisa Sponziello, Giorgio Grani, Giulia Fiscon, Paola Paci, Lorenzo Farina, Rosa Falcone, Valentina Maggisano, Sebastiano Filetti, Cosimo Durante, Antonella Verrienti   +11 more
wiley   +1 more source