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Determination of shielding factors for typical buildings in Brazil; Determinacao dos fatores de blindagem para construcoes tipicamente brasileiras

Abstract

This study presents a methodology for the determination of the air kerma inside buildings due to contamination on the external surfaces and the shielding factors for the construction material to be used on emergency assessment systems for urban areas. The commonly used construction materials were simulated with the MCNP computer code. A special methodology to simulate the bricks with holes were developed, mixing all different regions into a single one, making the simulation easier and faster. The effective density and the attenuation coefficients for the 50-3000 keV energy range were determined. The effective protection for the bricks with no cement cover decreases by 40-50% for energies greater then 300 keV when compared to bricks covered on both sides. With the data made available it was possible to evaluate the influence of the construction materials densities and thickness on the exposure due to external surfaces contamination and to estimate the error on the dose when the shielding factor applied on the calculation differs from the more realistic ones. The shielding factors for three types of walls were determined for a five rooms house. Special protection procedures should be applied for houses built with bricks with no cement cover, because they are  More>>
Publication Date:
Oct 15, 2006
Product Type:
Thesis/Dissertation
Report Number:
INIS-BR-4504
Resource Relation:
Other Information: TH: Tese (Ph.D.); 76 refs., 19 figs., 27 tabs
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; BIOLOGICAL SHIELDING; BIOLOGICAL SHIELDS; CONTROLLED AREAS; DOSIMETRY; RADIATION PROTECTION; SHIELDING; SHIELDING MATERIALS; URBAN AREAS; URBAN POPULATIONS
OSTI ID:
21013982
Research Organizations:
Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia (COPPE)
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
TRN: BR08V1075036340
Availability:
Available from INIS in electronic form
Submitting Site:
BRN
Size:
136 pages
Announcement Date:
Apr 26, 2008

Citation Formats

Salinas, Isabel Cristina Poquet. Determination of shielding factors for typical buildings in Brazil; Determinacao dos fatores de blindagem para construcoes tipicamente brasileiras. Brazil: N. p., 2006. Web.
Salinas, Isabel Cristina Poquet. Determination of shielding factors for typical buildings in Brazil; Determinacao dos fatores de blindagem para construcoes tipicamente brasileiras. Brazil.
Salinas, Isabel Cristina Poquet. 2006. "Determination of shielding factors for typical buildings in Brazil; Determinacao dos fatores de blindagem para construcoes tipicamente brasileiras." Brazil.
@misc{etde_21013982,
title = {Determination of shielding factors for typical buildings in Brazil; Determinacao dos fatores de blindagem para construcoes tipicamente brasileiras}
author = {Salinas, Isabel Cristina Poquet}
abstractNote = {This study presents a methodology for the determination of the air kerma inside buildings due to contamination on the external surfaces and the shielding factors for the construction material to be used on emergency assessment systems for urban areas. The commonly used construction materials were simulated with the MCNP computer code. A special methodology to simulate the bricks with holes were developed, mixing all different regions into a single one, making the simulation easier and faster. The effective density and the attenuation coefficients for the 50-3000 keV energy range were determined. The effective protection for the bricks with no cement cover decreases by 40-50% for energies greater then 300 keV when compared to bricks covered on both sides. With the data made available it was possible to evaluate the influence of the construction materials densities and thickness on the exposure due to external surfaces contamination and to estimate the error on the dose when the shielding factor applied on the calculation differs from the more realistic ones. The shielding factors for three types of walls were determined for a five rooms house. Special protection procedures should be applied for houses built with bricks with no cement cover, because they are due to the double of the dose when compared to houses built with bricks two-sided cement covered. The influence of windows and doors were evaluated too. This work was developed at the IRD in order to provide information on the construction material commonly uses on building in Brazil. (author)}
place = {Brazil}
year = {2006}
month = {Oct}
}