Papers by Kiadtisak Saenboonruang
Results in physics, Feb 1, 2024
This work assessed the theoretical neutron-shielding capabilities of autonomously self-healing po... more This work assessed the theoretical neutron-shielding capabilities of autonomously self-healing poly(vinyl alcohol) (PVA) hydrogels containing rare-earth oxides, namely samarium oxide (Sm 2 O 3), europium oxide (Eu 2 O 3), and gadolinium oxide (Gd 2 O 3), through PHITS and GEANT4 simulations. The assessment covered a range of filler contents (from 0 to 20 %wt in 4 %wt increments) and neutron energies (0.025 eV, 1 MeV, and 4 MeV). The determination showed that there was good agreement between the results from both simulations (average percentage difference of 0.39 %), with the thermal neutron-shielding properties of the hydrogels improving as the filler content increased, evidenced by the hydrogels containing 20 %wt of the fillers, especially those with Gd 2 O 3 , exhibiting the highest overall shielding properties. On the other hand, the deviations in the ability to attenuate fast neutrons (1 MeV and 4 MeV) with respect to filler contents were less pronounced than those for thermal neutrons. Additionally, the recommended filler contents for actual production were also determined by comparing the results in this work with those obtained from two common 5 wt% borated hydrogels. The comparison revealed that the recommended contents for Sm 2 O 3 , Eu 2 O 3 , and Gd 2 O 3 were 9.8, 12.3, and 1.6 %wt, respectively, of which the smallest recommended content of Gd 2 O 3 confirmed the superiority of Gd 2 O 3 in thermal neutron attenuation. Lastly, the overall outcomes from this work suggested that PVA hydrogels, with the addition of rare-earth oxides as fillers, could serve as promising, effective neutron-shielding materials, with the added benefit of being self-healable that prolonged the lifetime of the developed shielding hydrogels as well as enhancing the safety of personnel.
Polymers, Apr 18, 2024
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Philippine Journal of Science
This work investigated the grass/soil concentration ratios (CRs) of natural radionuclides (226Ra,... more This work investigated the grass/soil concentration ratios (CRs) of natural radionuclides (226Ra, 232Th, and 40K) in vetiver grass collected from three different regions of Thailand using an HPGe (high-purity germanium) gamma spectrometer. The sampled grass blades were divided into three equal parts to investigate the dependence of grass/soil CRs on the positions of grass blades. The results showed that 40K had the highest grass/soil CRs due to being an essential nutrient for most plants, with ranges of 1.12–7.92, in comparison with 226Ra and 232Th that had ranges of 0.32–1.48 and 0.20–1.31, respectively. In addition, the results indicated that the natural radionuclides investigated were uniformly transferred and accumulated throughout grass blades (p < 0.05), which implied the independence of CRs on the section of the leaf. Furthermore, it was found that the soil samples collected from the central region of Thailand had the highest activity concentrations in all radionuclides, m...
IOP Conference Series: Materials Science and Engineering, 2019
Development of efficient neutron-shielding materials has become one of the most important issues ... more Development of efficient neutron-shielding materials has become one of the most important issues in radiation safety. In order to estimate shielding performances of the materials of interest, simulations of neutron-shielding characteristics using well-proved methods are necessary. In this work, a Monte Carlo code of Particle and Heavy Ion Transport code System (PHITS) was used to simulate neutron-shielding properties of HDPE composites that were added with either B2O3, Sm2O3, Gd2O3, or CdO as a filler at various contents. The energy of the incoming neutrons was fixed at 0.025 eV with the beam direction pointing at the right angle to the material’s surface. The results showed that Gd2O3/HDPE composites had the lowest neutron transmission ratio compared with other fillers at the same contents, implying the highest neutron-shielding ability. Furthermore, the simulations also showed that the values of neutron transmission ratios of all fillers decreased with increasing filler’s contents...
The 12 GeV upgrade at Jefferson Lab (JLAB) makes many exciting nuclear experiments possible. Thes... more The 12 GeV upgrade at Jefferson Lab (JLAB) makes many exciting nuclear experiments possible. These experiments also require new high performance instrumentation. The Super Bigbite Spectrometer (SBS) was proposed to perform a series of high precision nucleon form factor experiments at large momentum transfer. The SBS will be capable of operating at a very high luminosity and provide a large solid angle acceptance of 76 msr. SBS will be equipped with a double focal plane polarimeter. Thus, SBS will have three large trackers made of Gas Electron Multiplier (GEM) chambers. The first, second, and third trackers will consist of six, four, and four tracking layers respectively. When completed in 2017, the SBS GEM trackers will form one of the largest sets of GEM chambers in the world. The GEM trackers allow the SBS to operate under high background rates over 500 kHz/cm^2, while providing an excellent spatial resolution of 70 μm. The first tracker will be constructed at the Istituto Naziona...
This work assessed the theoretical neutron-shielding capabilities of autonomously self-healing po... more This work assessed the theoretical neutron-shielding capabilities of autonomously self-healing poly(vinyl alcohol) (PVA) hydrogels containing rare-earth oxides, namely samarium oxide (Sm 2 O 3), europium oxide (Eu 2 O 3), and gadolinium oxide (Gd 2 O 3), through PHITS and GEANT4 simulations. The assessment covered a range of filler contents (from 0 to 20 %wt in 4 %wt increments) and neutron energies (0.025 eV, 1 MeV, and 4 MeV). The determination showed that there was good agreement between the results from both simulations (average percentage difference of 0.39 %), with the thermal neutron-shielding properties of the hydrogels improving as the filler content increased, evidenced by the hydrogels containing 20 %wt of the fillers, especially those with Gd 2 O 3 , exhibiting the highest overall shielding properties. On the other hand, the deviations in the ability to attenuate fast neutrons (1 MeV and 4 MeV) with respect to filler contents were less pronounced than those for thermal neutrons. Additionally, the recommended filler contents for actual production were also determined by comparing the results in this work with those obtained from two common 5 wt% borated hydrogels. The comparison revealed that the recommended contents for Sm 2 O 3 , Eu 2 O 3 , and Gd 2 O 3 were 9.8, 12.3, and 1.6 %wt, respectively, of which the smallest recommended content of Gd 2 O 3 confirmed the superiority of Gd 2 O 3 in thermal neutron attenuation. Lastly, the overall outcomes from this work suggested that PVA hydrogels, with the addition of rare-earth oxides as fillers, could serve as promising, effective neutron-shielding materials, with the added benefit of being self-healable that prolonged the lifetime of the developed shielding hydrogels as well as enhancing the safety of personnel.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Antioxidants
As the world is facing rapid increases in agricultural wastes that greatly affect global health, ... more As the world is facing rapid increases in agricultural wastes that greatly affect global health, the environment, and economies, this work aims to alleviate such issues by introducing simple uses of waste fruit peel powder (FPP) derived from mangosteen (MPP), pomelo (PPP), or durian (DPP), as dual natural antioxidants and reinforcing bio-fillers in natural rubber latex (NRL) gloves. A thorough investigation was undertaken of the relevant characteristics for both FPP (morphological, functional groups, particle sizes, and thermals stability) and NRL gloves (morphological, functional groups, density, color, thermal stability, and mechanical properties—both before and after thermal/25 kGy gamma aging). The results indicated that the initial addition (2–4 parts per hundred parts of rubber by weight; phr) of FPP to NRL composites generally enhanced the strength and elongation at the break of the specimens, with the levels of the improvement varying depending on the type and content of FPP...
Polymers for Advanced Technologies
Journal of Environmental Radioactivity
International Journal of Environmental Research and Public Health
At present, much emphasis is placed on the health risks associated with radioactivity present in ... more At present, much emphasis is placed on the health risks associated with radioactivity present in the environment, especially since the accident at the Fukushima Daiichi Nuclear Power Plant. In this study, a walking survey was conducted in Hirosaki City using a NaI(Tl) scintillation spectrometer to estimate and map the distribution of the ambient dose equivalent rate to monitor the radiological safety of the general public in Hirosaki City, where many nuclear facilities are located nearby. The average (±standard deviation) ambient dose equivalent rate was 0.056 ± 0.020 µSv h−1. By comparison with the measurement data, it was found that the values of 85% of the data obtained using the walking survey technique deviated within ±20% relative to those obtained by spot measurements. Furthermore, the distribution of dose rates obtained in the nighttime survey was not significantly different from those obtained in the daytime.
arXiv (Cornell University), May 2, 2022
The strong interaction is not well understood at low energy, or for interactions with low momentu... more The strong interaction is not well understood at low energy, or for interactions with low momentum transfer Q 2 , but one of the clearest insights we have comes from Chiral Perturbation Theory (χPT). This effective treatment gives testable predictions for the nucleonic generalized polarizabilitiesfundamental quantities describing the nucleon's response to an external field. We have measured the proton's generalized spin polarizabilities in the region where χPT is expected to be valid. Our results include the first ever data for the transverse-longitudinal spin polarizability δLT , and also extend the coverage of the polarizability d2 to very low Q 2 for the first time. These results were extracted from moments of the structure function g2, a quantity which characterizes the internal spin structure of the proton. Our experiment ran at Jefferson Lab using a polarized electron beam and a polarized solid ammonia (NH3) target. The δLT polarizability has remained a challenging quantity for χPT to reproduce, despite its reduced sensitivity to higher resonance contributions; recent competing calculations still disagree with each other and also diverge from the measured neutron data at very low Q 2. Our proton results provide discriminating power between existing calculations, and will help provide a better understanding of this strong QCD regime.
Physical Review Letters, 2016
Journal of Physics: Conference Series, 2019
Tritium can replace a hydrogen atom in water molecules since oxygen atom can react with tritium a... more Tritium can replace a hydrogen atom in water molecules since oxygen atom can react with tritium atoms to form water molecules the same way as for hydrogen atoms, potentially posing hazardous to consumers. This study aims to measure tritium activity concentrations in tap water samples collected from different regions in Thailand, (Phayao, Srisaket, Chanthaburi, Trang and Bangkok) in November 2018. The measurements of tritium activity concentrations were carried out by using electrolytic enrichment and low background liquid scintillation counting (AccuFLEX LSC-LB7), which had a sensitivity of less than 1 Bq/L. The data results of regional distribution of a tendency were discussed according to latitudes and longitudes of the collecting location. The measured tritium concentrations in tap water were in the range of 0.41 – 0.75 Bq/L. Specifically, the results showed that the tritium activity concentrations depended on location, with the highest value obtained from a tap water sample coll...
IOP Conference Series: Materials Science and Engineering, 2019
In this work, gamma shielding, cure characteristics, and mechanical properties of natural rubber ... more In this work, gamma shielding, cure characteristics, and mechanical properties of natural rubber (NR) and wood/NR composites was investigated with the addition of lead (Pb) powder for potential use as flexible shielding materials. The content of Pb powder in this work was varied from 0 to 50 part per hundred parts of rubber by weight (phr) in 10-phr increment. The results showed that the increases in Pb contents led to the improvement in gamma attenuation but had negligible effects on cure properties of the composites. The increases in Pb contents reduced overall tensile properties of the NR and wood/NR composites, while the addition of 20-phr wood particles in wood/NR composites increased the tensile strength, elongation at break, surface hardness, and dimensional stability. Hence, the overall properties investigated in this work suggested that the developed NR and wood/NR composites could be used to attenuate low-intensity gamma rays produced after former steps of shielding such a...
Polymers
Due to rapid increases in the utilization of radiation and nuclear technologies, effective and su... more Due to rapid increases in the utilization of radiation and nuclear technologies, effective and suitable radiation-shielding materials have become one of the most sought-after options to protect users and the public from excessive exposure to the radiation. However, most radiation-shielding materials have greatly reduced mechanical properties after the addition of fillers, resulting in their limited useability and shortened lifetime. Therefore, this work aimed to alleviate such drawbacks/limitations by exploring a possible method to simultaneously enhance both the X-ray shielding and mechanical properties of bismuth oxide (Bi2O3)/natural rubber (NR) composites through multi-layered structures, with varying (1–5) layers and a total combined thickness of 10 mm. To correctly determine the effects of the multi-layered structures on the properties of NR composites, the formulation and layer configuration for all multi-layered samples were tailored such that their theoretical X-ray shieldi...
Polymers
The neutron- and X-ray-shielding, morphological, physical, mechanical, and self-healing propertie... more The neutron- and X-ray-shielding, morphological, physical, mechanical, and self-healing properties were investigated for natural rubber (NR) composites containing varying gadolinium oxide (Gd2O3) contents (0, 25, 50, 75, and 100 parts per hundred parts of rubber; phr) to investigate their potential uses as self-healing and flexible neutron- and X-ray-shielding materials. Gd2O3 was selected as a radiation protective filler in this work due to its preferable properties of having relatively high neutron absorption cross-section (σabs), atomic number (Z), and density (ρ) that could potentially enhance interaction probabilities with incident radiation. The results indicated that the overall neutron-shielding and X-ray-shielding properties of the NR composites were enhanced with the addition of Gd2O3, as evidenced by considerable reductions in the half-value layer (HVL) values of the samples containing 100 phr Gd2O3 to just 1.9 mm and 1.3 mm for thermal neutrons and 60 kV X-rays, respecti...
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Papers by Kiadtisak Saenboonruang