Development of Novel Neutron Shielding Concrete

Okuno, Koichi; Kawai, Masayoshi; Yamada, Hitoshi

doi:10.13182/nt09-a9241

Cited by 26 publications

(22 citation statements)

References 6 publications

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“…The aim of this paper is to show the possibility of using the Monte Carlo (MC) simulation codes for evaluation and optimization of concrete mix to reach better neutron shielding. The performance of neutron shielding concrete has already been simulated and investigated experimentally by Okuno et al [2]. Gallego et al [3] compared experimental results using 241 Am-Be neutron soures to MCNP5 calculation resutls (MCNP5 is the same package as MCNPX [4] for low energy neutrons: less than 20 MeV) and they found some differences with regard to the experiments.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulations for optimization of neutron shielding concrete

et al. 2012

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Concrete is one of the main materials used for gamma and neutron shielding. While in case of gamma rays an increase in density is usually efficient enough, protection against neutrons is more complex. The aim of this paper is to show the possibility of using the Monte Carlo codes for evaluation and optimization of concrete mix to reach better neutron shielding. Two codes (MCNPX and SPOT -written by authors) were used to simulate neutron transport through a wall made of different concretes. It is showed that concrete of higher compressive strength attenuates neutrons more effectively. The advantage of heavyweight concrete (with barite aggregate), usually used for gamma shielding, over the ordinary concrete was not so clear. Neutron shielding depends on many factors e.g. neutron energy, barrier thickness and atomic composition. All this makes a proper design of concrete as a very important issue for nuclear power plant safety assurance.

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Section: Introductionmentioning

confidence: 99%

Monte Carlo simulations for optimization of neutron shielding concrete

et al. 2012

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“…Ordinary concrete, colemanite-peridotite concrete (11) , B4C-loaded concrete, and limestone concrete are used in this research. Each concrete sample was made by us.…”

Section: Concrete Blocksmentioning

confidence: 99%

“…Serpentinite was used for neutron shielding concrete on the pedestal concrete shield on the reactor vessel in the fast breeder demonstration reactor Monju, (10) but it is not desirable for outer shields now because serpentinite is also a raw material for asbestos. To realize a compact shield satisfying the radiation dose criteria even in a limited space such as in a hospital, neutron shield concrete using colemanite and peridotite has been developed (11) . Such concrete has been used in four beam lines at the Materials and Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC) and in the shielding wall of the RIKEN accelerator-driven compact neutron source (RANS) (12) (13).…”

Section: Introductionmentioning

confidence: 99%

Activation experiment for concrete blocks using thermal neutrons

Okuno¹,

Tanaka²

2017

EPJ Web Conf.

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Abstract. Activation experiments for ordinary concrete, colemanite-peridotite concrete, B4C-loaded concrete, and limestone concrete are carried out using thermal neutrons. The results reveal that the effective dose for gamma rays from activated nuclides of colemanite-peridotite concrete is lower than that for the other types of concrete. Therefore, colemanite-peridotite concrete is useful for reducing radiation exposure for workers.

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“…It is due to the differences in interactions of free neutrons of different energies with the matter which depends strongly on the reaction cross-sections for different atoms of the cement paste and the aggregate. Nevertheless, some general recommendation have been already stated, such as increase of hydrogen content in concrete (more chemically bounded water) or addition of effective neutron absorbers (boron) [2]. Akkurt and Elkhayat [3] stated that the most effective shielding material for mixed neutron and gamma-rays is obtained by mixed hydrogenous materials, heavy metal elements, and other neutron absorbers.…”

Section: Introductionmentioning

confidence: 99%

NGS-Concrete - New Generation Shielding Concrete against Ionizing Radiation - the Potential Evaluation and Preliminary Investigation

et al. 2015

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Concrete is a common material used as a shielding against ionizing radiation due to the relatively low cost and the ability to meet the structural function. State of the art in concrete shielding is that while in case of gamma radiation an increase in density by a change of aggregate is usually efficient enough, protection against neutrons is more complex. It is due to the differences in interactions of neutrons with the matter, depending on their kinetic energy and reaction cross-sections with the component atoms of the cement paste and the aggregate. Last progress in concrete evolution due to use of polymer additives (e.g. superplasticizers) together with reactive additions (e.g. silica fume) allows for a new look at the concrete design for radiation shielding purposes. One of the main advantages of concrete is its composite-type and there is a potential for the optimization of its constituents as well as mixture proportions. The paper presents the preliminary results of the project NGS-Concrete -newgeneration shielding concrete against ionizing radiation. The aim of the project is to design the composition of concrete against ionizing radiation, achieved by the use of experiment based multi-criteria optimization of materials supported by the Monte Carlo simulations. The purpose of presented studies was to evaluate neutron shielding properties of ordinary and heavy-weight magnetite concrete modified with epoxy resin and gadolinium oxide. At first the shielding efficiency against neutrons from LWR neutron flux source and Pu-Be was simulated in MCNP code. At the end the comparison of MCNP simulated results and real experiment was presented. It was proved that both methods of modification can improve neutron shielding properties concrete but gadolinium oxide is an efficient additive only for low energy neutron attenuation.

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Development of Novel Neutron Shielding Concrete

Cited by 26 publications

References 6 publications

Monte Carlo simulations for optimization of neutron shielding concrete

Monte Carlo simulations for optimization of neutron shielding concrete

Activation experiment for concrete blocks using thermal neutrons

NGS-Concrete - New Generation Shielding Concrete against Ionizing Radiation - the Potential Evaluation and Preliminary Investigation

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