Abstract
The fibrous self-compacting concrete is a high performance concrete with uniformly distributed iron fibers, developed and characterized by Maragon (2006 and 2009). Transmission measurements, with 137Cs and 60Co sources were performed for the attenuation coefficients determination for both ordinary and fibrous self-compacting concretes. The results were compared to each other and to the values found in the literature for ordinary concrete. The mass attenuation coefficient for the fibrous self-compacting concrete showed to be higher than those for ordinary concrete of about 5%, depending on the gamma energy. However, it should be noted that the density of fibrous self-compacting concrete is higher than ordinary concrete, 2.4 g/cm3 and 1.9 g/cm3 respectively, increasing still further the difference in mass attenuation coefficient. In addition to that, by using Monte Carlo simulations, with MCNP5 Monte Carlo computer code, the data was extended to the 50-3000 keV gamma energy range.
Highlights
Due to the increasing use of radioactive isotopes and linear accelerators in several fields of applications, such as industries, energy production and medical, there is an increasing need to minimize the dose to the workers and to the public
In order to evaluate the measurement procedure used in this work, ordinary concrete was measured and the results obtained were compared to the values found in the literature (Hubbell, 1997)
The mass attenuation coefficients for a fibrous self-compacting concrete were determined by transmission measurement for the 137Cs and 60Co gamma emitting energies
Summary
Due to the increasing use of radioactive isotopes and linear accelerators in several fields of applications, such as industries, energy production and medical, there is an increasing need to minimize the dose to the workers and to the public. It was observed that heavy beach minerals, which are much denser than the other materials studied, showed photon attenuation coefficients higher than those for soil, sand and building materials. As it is well known, photon attenuation coefficients depend on the photon energy and the material’s density (Akkurt et al, 2004). Because of its higher attenuation coefficients and density than ordinary concrete, the use fibrous self-compacting concrete enables a reduction of walls thickness, without the cost and environmental impact risk created by the use of lead
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