A study of the use of palm fiber and palm shell as a thermal neutron radiation shielding material

Sitepu, Evi Christiani; Sembiring, Timbangen; Sebayang, Kerista; Sumirat, Iwan; Rianna, Martha; Marlianto, Eddy; Sukaryo, Sulistioso Giat

doi:10.1016/j.csite.2019.100468

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…A solution of the system of nonlinear algebraic Equations (15) which are obtained by the Bubnov-Galerkin procedure are found with the help of the Newton's iterative method. Integrations are carried out using the Newton-Cotes quadrature rules, where the shell volume is partitioned into 13 × 13 × 6 parts with regard to x, y, z, respectively.…”

Section: Reliability Of the Obtained Resultsmentioning

confidence: 99%

“…Sitepu et al [ 15 ] used palm fiber and palm shell as a thermal neutron radiation shielding material based on the neutron activation analysis and studied thermal neutron flux on gold pieces.…”

Section: Introductionmentioning

confidence: 99%

“…In studies [11][12][13][14][15][16][17], a generalized virtual modeling method using modern computer technologies to solve one-dimensional and two-dimensional nonlinear problems was proposed.…”

Section: Introductionmentioning

confidence: 99%

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Stability Improvement of Flexible Shallow Shells Using Neutron Radiation

et al. 2020

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Microelectromechanical systems (MEMS) are increasingly playing a significant role in the aviation industry and space exploration. Moreover, there is a need to study the neutron radiation effect on the MEMS structural members and the MEMS devices reliability in general. Experiments with MEMS structural members showed changes in their operation after exposure to neutron radiation. In this study, the neutron irradiation effect on the flexible MEMS resonators’ stability in the form of shallow rectangular shells is investigated. The theory of flexible rectangular shallow shells under the influence of both neutron irradiation and temperature field is developed. It consists of three components. First, the theory of flexible rectangular shallow shells under neutron radiation in temperature field was considered based on the Kirchhoff hypothesis and energetic Hamilton principle. Second, the theory of plasticity relaxation and cyclic loading were taken into account. Third, the Birger method of variable parameters was employed. The derived mathematical model was solved using both the finite difference method and the Bubnov–Galerkin method of higher approximations. It was established based on a few numeric examples that the irradiation direction of the MEMS structural members significantly affects the magnitude and shape of the plastic deformations’ distribution, as well as the forces magnitude in the shell middle surface, although qualitatively with the same deflection the diagrams of the main investigated functions were similar.

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Section: Reliability Of the Obtained Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stability Improvement of Flexible Shallow Shells Using Neutron Radiation

et al. 2020

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“…While natural fibers were previously mentioned in terms of shielding of X-rays, Sitepu et al investigated palm fibers and palm shell as a possible material for shielding of thermal neutron radiation using gold foil activation, that is, activating gold foils glued to the shielding sample by irradiation for 15 h and afterwards determining the activity of the gold foil, which is proportional to the neutron flux trough the sample [105]. This possibility was attributed to the high amount of carbon in palm fibers and shells, that is, more than 70%.…”

Section: Other Materials For Shielding Of Cosmic Radiationmentioning

confidence: 99%

Shielding of Cosmic Radiation by Fibrous Materials

Błachowicz

Ehrmann

2021

Fibers

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Cosmic radiation belongs to the challenges engineers have to deal with when further developing space travel. Besides the severe risks for humans due to high-energy particles or waves, the impact of cosmic radiation on electronics and diverse materials cannot be neglected, even in microsatellites or other unmanned spacecraft. Here, we explain the different particles or waves found in cosmic radiation and their potential impact on biological and inanimate matter. We give an overview of fiber-based shielding materials, mostly applied in the form of composites, and explain why these materials can help shielding spaceships or satellites from cosmic radiation.

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“…Neutron radiation takes place in many technological applications and neutrons are exposed during nuclear energy production, nuclear medicine, and aerospace applications. 1,2 Neutrons could penetrate deep into many materials and are hazardous to biological cells. The effect of neutron radiation on human health is catastrophic.…”

Section: Introductionmentioning

confidence: 99%

Boron‐containing nonwoven polymeric nanofiber mats as neutron shields in compact nuclear fusion reactors

Özcan

Kam

Kaya

et al. 2022

Intl J of Energy Research

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Summary Composite materials that contain thermally and chemically stable boron compounds are attractive candidates for applications that require high neutron absorption due to the large neutron absorption cross‐section of boron. Electrospun polymer nanofibers have a unique volume‐to‐surface area, incorporating carbon and hydrogen atoms in their molecular structure that could moderate and thermalize incident neutrons. Nonwoven nanofibers could in turn reduce neutron scattering and increase neutron absorption by providing large surfaces and better atom economy in the shield materials. The expected high absorption will result from improved neutron interaction with high neutron absorbance hydrogen, carbon, and boron atoms in the nanofibers through increased specific surface area and atom economy. In this work, elemental boron‐doped PVA polymeric nanofibers are produced for the first time to date for the application of neutron shielding. With the increasing demand for nuclear power generation and radiation therapies in medicine, the need for producing lightweight and flexible materials that could replace the traditional heavy metal/metal carbide‐based shields is vital. Similarly, the need for flexible materials that could shield neutrons is also becoming critical for aerospace applications. The effect of boron content on the quality of fibers and neutron shielding capacity is evaluated by using an Am‐Be neutron source. Characterization studies of produced nanofibers were carried out by SEM, TGA, FT‐IR, and XPS analyses. Results have shown that PVA‐based nanofibers doped with wt% 0.1 to 0.5 boron, having fiber diameter distribution between 60 and 330 nm range, could absorb up to 6% of neutron flux.

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A study of the use of palm fiber and palm shell as a thermal neutron radiation shielding material

Cited by 4 publications

References 14 publications

Stability Improvement of Flexible Shallow Shells Using Neutron Radiation

Stability Improvement of Flexible Shallow Shells Using Neutron Radiation

Shielding of Cosmic Radiation by Fibrous Materials

Boron‐containing nonwoven polymeric nanofiber mats as neutron shields in compact nuclear fusion reactors

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