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Thermal Insulation in Masonry Walls01:22

Thermal Insulation in Masonry Walls

In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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Related Experiment Video

Updated: May 11, 2026

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

Insulating epoxy/barite and polyester/barite composites for radiation attenuation.

M A El-Sarraf1, A El-Sayed Abdo

  • 1Nuclear and Radiological Regulatory Authority, 3 Ahmed El-Zomor Street, P.O. Box 7551, Nasr City 11762, Cairo, Egypt. magdsarraf@yahoo.com

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|June 1, 2013
PubMed
Summary

New epoxy and polyester composites filled with barite exhibit effective radiation shielding properties. These materials demonstrate good mechanical integrity, making them suitable for practical radiation attenuation applications.

Keywords:
Attenuation parametersCompositeMCNPMechanical propertiesPhysical PropertiesRadiation shielding

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Last Updated: May 11, 2026

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Area of Science:

  • Materials Science
  • Nuclear Engineering
  • Applied Physics

Background:

  • Development of effective radiation shielding materials is crucial for nuclear safety and medical applications.
  • Barite (BaSO4) is a dense mineral with potential for radiation attenuation.
  • Polymer composites offer tunable properties for specific shielding requirements.

Purpose of the Study:

  • To synthesize and characterize novel insulating Epoxy/Barite (EP/Brt) and Crosslinked Unsaturated Polyester/Barite (CUP/Brt) composites.
  • To evaluate the radiation attenuation and shielding capabilities of these composites.
  • To assess the mechanical and physical integrity for practical applications.

Main Methods:

  • Composite synthesis using barite filler in epoxy and polyester matrices.
  • Mechanical and physical property testing.
  • Radiation attenuation measurements using a (252)Cf neutron source and a neutron-gamma spectrometer with pulse shape discrimination (PSD).
  • Evaluation of fast neutron removal cross-section (ΣR), gamma-ray attenuation coefficient (µ), and thermal neutron cross-section (Σ).
  • Theoretical calculations using MCNP-4C2 and MERCSF-N programs.

Main Results:

  • EP/Brt composites (ρ=2.85 g cm(-3)) and CUP/Brt composites (ρ=3.25 g cm(-3)) were successfully created.
  • Composites demonstrated reasonable mechanical and physical properties.
  • Experimental and theoretical evaluations of neutron and gamma-ray attenuation parameters (ΣR, µ, Σ) showed good agreement.

Conclusions:

  • Epoxy/Barite and Crosslinked Unsaturated Polyester/Barite composites possess viable radiation shielding capabilities.
  • The synthesized composites offer a promising balance of mechanical integrity and radiation attenuation.
  • The findings support the practical application of these composites in radiation shielding scenarios.