4 rowsIn this study, novel boron carbide polyether-ether-ketone (PEEK) composites with different mass ...

This article describes the method for measuring the isotopic abundance of 10 B in nuclear grade boron carbide using inductively coupled plasma-quadrupole mass spectrometry (ICP-QMS). The results of investigation revealed that both the integration time and the dwell time have a major influence on the reproducibility of ICP-QMS measurements.

In BWRs, the primary poison material is boron carbide (B4 C) with a long history of use, going back to the original developments in the 1960s. B 4 C designs have relied on the naturally occurring isotope 10 B and its high thermal neutron cross-section to perform the poison function. With the capture of neutrons, the transmutation of boron leads ...

Here, we review the latest neutron shielding materials for the storage of spent nuclear fuel containing additives such as boron carbide (B4C), boron nitride (BN), boric acid (H3BO3), and ...

Section snippets Raw materials and composites preparation. First, boron carbide (B 4 C) particles (black powder having a density of 2.52 g/cm 3 with an average diameter of particles of 10 μm and purchased from Shanghai Aladdin Reagents, China) were mixed with an epoxy resin made of a mixture of 78% bisphenol A-based epoxy resin and …

A shield was designed with two layers, including nano-iron oxide and a layer of nano-boron carbide for eliminating fast neutrons. Results: MC simulation results with uncertainty less than 1% ...

absorption capability of boron carbide is attributed to the 10B isotopes which can capture neutrons through (n, α) reaction. During the (n, α) reaction, a certain amount of heat is released and accumulated in boron carbide pellets. So high thermal conductivity is necessary for boron carbide pellets to transfer the heat into the surrounding ...

A new approach for neutron detection enhancement to scintillator gamma-ray detectors is suggested. By using a scintillator coupled with a boron carbide (B 4 C) disc, the 478 keV gamma-photon emitted from the excited Li in 94% of the 10 B(n, α) 7 Li interactions was detected. This suggests that the performance of existing gamma …

Boron-containing compounds are known for their excellent radiation shielding capability against slow neutrons. To prepare an unalkaline and alkaline-treated industrial-grade boron carbide neutron-shielding radiation ultra-high performance mortar (UHPM) with varying cement replacement ratios, a modified Andreasen＆Andersen (A&A) model …

The boron concentration in non-irradiated B 4 C boron carbide is about 1.1x10 23 .cm −3. As a result, the mean atomic composition of the irradiated material is taken as B 0.72 C 0.2 He 0.08 Li 0.08. The initial 10 B enrichment of boron is taken as 48%, which reduces to 39% for a 10 22 .cm −3 burnup.

Neutron absorbers are used to control the criticality of spent nuclear fuel storage systems, including borated stainless steel, B4C/Al composite, amorphous alloys, and B/Al alloy. Neutron shielding materials contain polymer-based composites, high density concrete, heavy metals, paraffin, and other neutron …

Boron-Rich Boron Carbide Nanoparticles as a Carrier in Boron Neutron Capture Therapy: Their Influence on Tumor and Immune Phagocytic Cells - PMC Journal …

Boron carbide (B 4 C) is widely used as a neutron-absorbing material because of its high reaction cross-section of 10 B, high melting point (2763 K), and low …

Boron carbide (B4C) ceramics with high thermal stability and relatively large cross-section for fast neutron absorption have been used as neutron absorbers of the control rods for the fast breeder ...

The boron carbide and ferro boron added in concrete are ranged from 0% to 20%. However, the concrete prepared with Fe–B resulted in better shielding performance than B 4 C added one as the Fe–B contains iron particles that have the tendency to slow down fast neutrons by means of the inelastic scattering mechanism [ 41 ].

Background. Boron Carbide (B 4 C) is one of the hardest materials known, ranking third behind diamond and cubic boron nitride. It is the hardest material produced in tonnage quantities. Originally …

iii . ABSTRACT . Boron carbide (B. 4. C) is one of the most important opaque boride ceramics that has high hardness and Young's modulus that along with low density lead to a significant resistance to ballistic impact

According to the simulations results, it is clear that concrete by adding different proportions of boron carbide and Ferro - boron can enhance neutron shielding property …

Boron Neutron Capture Therapy (BNCT) is a radiation science which is emerging as a hopeful tool in treating cancer, by selectively concentrating boron compounds in tumour cells and then subjecting the tumour cells to epithermal neutron beam radiation. BNCT bestows upon the nuclear reaction that occurs when Boron-10, a stable …

The neutron transmission and scattering from a composite of 25% weight boron carbide and nylon (Addbor N25) has been measured as a function of wavelength. …

Boron carbide (B4C) is a ceramic material commonly used for neutron absorption in nuclear applications. 10B is one of two naturally occurring isotopes of boron (the other is 11B). It has a high capture cross - section for thermal neutrons (3837 barns) making boron to be an attractive material for nuclear physics and technology.

The aim of this paper is to show the possibility of using the Monte Carlo code (MCBEND®) for evaluation and optimization of polyethylene with high boron loadings (for up to 40%) to reach better neutron shielding against fast neutrons (Am-Be neutron source). Boron is incorporated in polyethylene as boron carbide (B 4 C). MCBEND® (Monte …

First, boron carbide (B 4 C) particles (black powder having a density of 2.52 g/cm 3 with an average diameter of particles of 10 μm and purchased from Shanghai Aladdin Reagents, China) were mixed with an epoxy resin made of a mixture of 78% bisphenol A-based epoxy resin and 22% cycloaliphatic amine hardener, obtained from Huntsman …

A high-energy neutron reaction with boron produces tritium. In the LMFBR control material, B/sub 4/C, most of the tritium that is generated remains in the pellets. Potential retention mechanisms are discussed. 5 figures. Conference: 79. annual meeting of American Ceramic Society, Chicago, Illinois, United States of America (USA), 23 Apr 1977.

Regarding the fillers used in the composite, graphite and graphite-based fabrics were used mainly to slow down fast neutrons while for neutron capture the most preferrend compounds are boron compounds and in particular boric acid (H 3 BO 3) which is the most economic, followed by boron carbide B 4 C and boron nitride BN.

Boron Carbide grain size F 280 Particle size indication 59 - 22 micron; Boron Carbide grain size F 320 Particle size indication 49 - 16.5 micron; Boron Carbide grain size F 360 Particle size indication 40-12 micron; Boron Carbide grain size F 400 Particle size indication 32 - 8 micron; Boron Carbide grain size F 600 Particle size indication 19 ...

As science and technology progress, neutrons have seen wider and wider use in many different fields, such as materials science, agriculture, medicine, and defense [1,2]. However, excessive exposure to radiation, including neutrons, can damage human health and the environment [3]. ... Boron carbide (B 4 C) composites with 4 wt% …

Kipcak AS, Gurses P, Derun EM, et al. Characterization of boron carbide particles and its shielding behavior against neutron radiation. Energy Convers Manag 2013; 72: 39–44. Crossref. ISI. ... Gaber F. Utilization of ilmenite/epoxy composite for neutrons and gamma rays attenuation. Ann Nucl Energy 2003; 30(2): 175–187. Crossref. Google ...

Neutrons interact directly with the nucleus because they are not affected by electrical fields. The interaction of cross sections of neutrons with the nucleus of the isotope depends on the energy of the incoming neutrons. ... Boron carbide is an alternate aggregate material used in concrete composites, but its distribution is poor due to its ...

Aluminum-based boron carbide is usually used as a neutron absorber to maintain the subcriticality of the fuel assembly by absorbing thermal neutrons . Boron–aluminum alloy is only used for dry storage system canister designs. ... Neutrons are classified into thermal neutrons (0.0253 eV), slow neutrons (0.0253 eV~1 KeV), …