Hoai-Phuong Pham, Nhi-Dien Nguyen, Xuan Tan Nguyen, The-Dat Trang, Quang Dong Ong, K. Nguyen
In this work, we designed and built a digital multichannel analyzer (DMCA) using field-programmable gate array (FPGA), which is used to build a spectroscopic measurement system for a tomography device. DMCA's hardware was built with an ADC with 14-bit resolution and a sampling rate of 105 million samples per second (MSPs) combined with an FPGA board. The models of three functional blocks in DMCA, including pulse shaping filter, peak detection, and spectrum histogram processing, were simulated and optimized in the Matlab environment before they were integrated on the FPGA chip. The performance of DMCA was evaluated based on the high purity germanium (HPGe) detector with standard sources 60Co and 137Cs. The spectrum measured on the DMCA system showed that the drift of the spectral peak over time (100 hours) was of less than 1% and a resolution of 2.6 keV was at 1332 keV 60Co. The DMCA developed in this work demonstrated various advantages: stability, compactness, versatility, and cost effectiveness.
{"title":"Development of a Compact Digital Multichannel Analyzer based on FPGA","authors":"Hoai-Phuong Pham, Nhi-Dien Nguyen, Xuan Tan Nguyen, The-Dat Trang, Quang Dong Ong, K. Nguyen","doi":"10.53747/nst.v14i1.456","DOIUrl":"https://doi.org/10.53747/nst.v14i1.456","url":null,"abstract":"In this work, we designed and built a digital multichannel analyzer (DMCA) using field-programmable gate array (FPGA), which is used to build a spectroscopic measurement system for a tomography device. DMCA's hardware was built with an ADC with 14-bit resolution and a sampling rate of 105 million samples per second (MSPs) combined with an FPGA board. The models of three functional blocks in DMCA, including pulse shaping filter, peak detection, and spectrum histogram processing, were simulated and optimized in the Matlab environment before they were integrated on the FPGA chip. The performance of DMCA was evaluated based on the high purity germanium (HPGe) detector with standard sources 60Co and 137Cs. The spectrum measured on the DMCA system showed that the drift of the spectral peak over time (100 hours) was of less than 1% and a resolution of 2.6 keV was at 1332 keV 60Co. The DMCA developed in this work demonstrated various advantages: stability, compactness, versatility, and cost effectiveness.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141678721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Van Hoang Dao, M. Ho, Thi Thanh Nhan Doan, Van Hoai Nam Nguyen, V. Ho, Hoang Long Nguyen, Huu Loi Le, Quang Son Ong, Thi Thao Quyen Trinh
The repeatability and reproducibility need to be investigated to evaluate the stability of low-level radioactivity measurements with respect to an analysis method, as well as their dependence on measuring parameters. In this study, the procedures for gross alpha/beta and gamma-ray activity measurements were investigated in the Department of Radiation and Environment Safety at the Center for Nuclear Technologies (CNT). Moreover, an interlaboratory comparison was organized with other institutions, i.e. Dalat Nuclear Research Institute (DNRI), Institute for Nuclear Science and Technology (INST), and Institute of Public Health in HCM (IPH-HCM). To evaluate the repeatability and reproducibility of measures undertaken by the low-level radioactivity measurements, the certified reference materials (CRM), i.e. IAEA-CRM-385 (Natural and artificial radionuclides in sediment from the Irish Sea), NIST-SRM-4322c (Americium-241 Radioactivity Standard), and IAEA-CRM-RGK-1, together with 6 collected real samples were analyzed for 238U, 232Th, 226Ra, 228Ra, 210Pb and 40K. The analysis of variance (ANOVA) tool with respect to the average, standard deviation, F, p-value, and F-crit parameters was applied for the evaluation. The obtained results in the study revealed that the repeatability and reproducibility were stable for the low-level radioactivity measurements at the CNT which meets the laboratory’s quality management requirements.
{"title":"Study on the repeatability and reproducibility of low-level radioactivity measurements using the analysis of variance tool","authors":"Van Hoang Dao, M. Ho, Thi Thanh Nhan Doan, Van Hoai Nam Nguyen, V. Ho, Hoang Long Nguyen, Huu Loi Le, Quang Son Ong, Thi Thao Quyen Trinh","doi":"10.53747/nst.v14i1.446","DOIUrl":"https://doi.org/10.53747/nst.v14i1.446","url":null,"abstract":"The repeatability and reproducibility need to be investigated to evaluate the stability of low-level radioactivity measurements with respect to an analysis method, as well as their dependence on measuring parameters. In this study, the procedures for gross alpha/beta and gamma-ray activity measurements were investigated in the Department of Radiation and Environment Safety at the Center for Nuclear Technologies (CNT). Moreover, an interlaboratory comparison was organized with other institutions, i.e. Dalat Nuclear Research Institute (DNRI), Institute for Nuclear Science and Technology (INST), and Institute of Public Health in HCM (IPH-HCM). To evaluate the repeatability and reproducibility of measures undertaken by the low-level radioactivity measurements, the certified reference materials (CRM), i.e. IAEA-CRM-385 (Natural and artificial radionuclides in sediment from the Irish Sea), NIST-SRM-4322c (Americium-241 Radioactivity Standard), and IAEA-CRM-RGK-1, together with 6 collected real samples were analyzed for 238U, 232Th, 226Ra, 228Ra, 210Pb and 40K. The analysis of variance (ANOVA) tool with respect to the average, standard deviation, F, p-value, and F-crit parameters was applied for the evaluation. The obtained results in the study revealed that the repeatability and reproducibility were stable for the low-level radioactivity measurements at the CNT which meets the laboratory’s quality management requirements.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141679062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Machine learning (ML) using artificial neural network (ANN) methods is being applied to predict required parameters for nuclear reactors based on learning from big data sets. The ML models usually give faster calculation speed while the accuracy is good agreement with physical simulators. In this work, a multi-layer perceptron network was built and trained to predict k-eff and peaking factor of a small modular pressurized water reactor (PWR). The results are compared with those obtained by using a reactor physics code system, i.e. SRAC2006. The comparison shows good agreement accuracy and higher performance of the ML models.
{"title":"A study on the application of artificial neural network to predict k-eff and peaking factor of a small modular PWR","authors":"Tran Chung Le, Thi Dung Nguyen, Viet Phu Tran","doi":"10.53747/nst.v14i1.413","DOIUrl":"https://doi.org/10.53747/nst.v14i1.413","url":null,"abstract":"Machine learning (ML) using artificial neural network (ANN) methods is being applied to predict required parameters for nuclear reactors based on learning from big data sets. The ML models usually give faster calculation speed while the accuracy is good agreement with physical simulators. In this work, a multi-layer perceptron network was built and trained to predict k-eff and peaking factor of a small modular pressurized water reactor (PWR). The results are compared with those obtained by using a reactor physics code system, i.e. SRAC2006. The comparison shows good agreement accuracy and higher performance of the ML models.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141677117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Nguyen, Ba Duy Bui, D. Cao, Thi Lien Nguyen, Xuan Dinh Luu
This report presents the results of study on the column leaching process of rare earths from ion adsorption clay by ammonium sulfate at laboratory scale. Total rare earths content in ion adsorption clay about 350 - 550 ppm. The influence of factors such as solution concentration (NH4)2SO4, time leaching, solid/liquid ratio, number of stage washing ... on the rare earth recovery efficiency was evaluated. The obtained results showed that the rare earth recovery efficiency was up to about 90% under optimal conditions. The obtained technological parameters will re-evaluated at pilot scale (500 kg/batch) to assess the possibility of larger scale development.
{"title":"Study on column leaching process of rare earths from ion adsorption clays by ammonium sulfate","authors":"V. Nguyen, Ba Duy Bui, D. Cao, Thi Lien Nguyen, Xuan Dinh Luu","doi":"10.53747/nst.v14i1.433","DOIUrl":"https://doi.org/10.53747/nst.v14i1.433","url":null,"abstract":"This report presents the results of study on the column leaching process of rare earths from ion adsorption clay by ammonium sulfate at laboratory scale. Total rare earths content in ion adsorption clay about 350 - 550 ppm. The influence of factors such as solution concentration (NH4)2SO4, time leaching, solid/liquid ratio, number of stage washing ... on the rare earth recovery efficiency was evaluated. The obtained results showed that the rare earth recovery efficiency was up to about 90% under optimal conditions. The obtained technological parameters will re-evaluated at pilot scale (500 kg/batch) to assess the possibility of larger scale development.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141679335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hong Lam Pham, Tien Dung Phan, Phuong Quy Vu, Quang Trung Pham
This study aims to comprehensively evaluate and compare lung Stereotactic Body Radiation Therapy (SBRT) dose distribution using the Eclipse v13.6 treatment planning system and TrueBeam STx linac data, employing two dose calculation algorithms: Analytical Anisotropic Algorithm (AAA) and Acuros External Beam (AXB). Utilizing thirty-five 4DCT lung SBRT datasets, dose calculations were performed with both algorithms, maintaining consistent setup conditions except for the varied calculation algorithm. Evaluation criteria included tumor dose distribution Conformity Index (CI), Homogeneity Index (HI), Gradient Index (GI), D2cm, V105%, Dmax and organs-at-risk (OAR) doses, assessed via Dose Volume Histogram (DVH) analysis. Additionally, linac parameters such as Monitor Unit (MU) and Beam on Time (BoT) were analyzed. Both algorithms met dose criteria for tumors and OAR tolerance. Minor differences were observed in tumor distribution indices, with AXB's Gradient Index showing proximity to ideal values. Although AXB exhibited slightly higher OAR doses, differences were statistically insignificant. AXB also demonstrated reduced average MUs and BoT. This comparative analysis underscores the efficacy of both AAA and AXB algorithms in ensuring dose conformity and OAR tolerance in lung SBRT planning, with AXB potentially offering improvements in efficiency and patient safety.
{"title":"Evaluation and Comparison of AAA and AXB Dose Calculation Algorithms for Lung SBRT on TrueBeam STx with Eclipse 13.6","authors":"Hong Lam Pham, Tien Dung Phan, Phuong Quy Vu, Quang Trung Pham","doi":"10.53747/nst.v14i1.465","DOIUrl":"https://doi.org/10.53747/nst.v14i1.465","url":null,"abstract":"This study aims to comprehensively evaluate and compare lung Stereotactic Body Radiation Therapy (SBRT) dose distribution using the Eclipse v13.6 treatment planning system and TrueBeam STx linac data, employing two dose calculation algorithms: Analytical Anisotropic Algorithm (AAA) and Acuros External Beam (AXB). Utilizing thirty-five 4DCT lung SBRT datasets, dose calculations were performed with both algorithms, maintaining consistent setup conditions except for the varied calculation algorithm. Evaluation criteria included tumor dose distribution Conformity Index (CI), Homogeneity Index (HI), Gradient Index (GI), D2cm, V105%, Dmax and organs-at-risk (OAR) doses, assessed via Dose Volume Histogram (DVH) analysis. Additionally, linac parameters such as Monitor Unit (MU) and Beam on Time (BoT) were analyzed. Both algorithms met dose criteria for tumors and OAR tolerance. Minor differences were observed in tumor distribution indices, with AXB's Gradient Index showing proximity to ideal values. Although AXB exhibited slightly higher OAR doses, differences were statistically insignificant. AXB also demonstrated reduced average MUs and BoT. This comparative analysis underscores the efficacy of both AAA and AXB algorithms in ensuring dose conformity and OAR tolerance in lung SBRT planning, with AXB potentially offering improvements in efficiency and patient safety.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141679149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Van-Toan Phan, Van-Hung Nguyen, Van Dung Pham, Ngoc Thiem Le, Hung Thai Pham
This work presents an in-house synthesis process of K2GdF5:Tb thermoluminescence (TL) powder by using the solid-state reaction method. The K2GdF5:Tb powder TL glow curves (called as TL spectra), responded to photons (i.e., X-ray beams, gammas) and neutrons, have been investigated to optimize the setting parameters of the TL reader. Batch homogeneity of the in-house synthesized K2GdF5:Tb powder has been investigated to study the feasibility in photon and neutron personal dosimetry. The batch homogeneity of the in-house synthesized K2GdF5:Tb powder was investigated as less than 27.0%, which satisfied the requirement of the IEC and the ISO criteria (maximum of 30.0% is acceptable).
{"title":"Thermoluminescence characteristics of in-house synthesized K2GdF5:Tb powder for photon and neutron","authors":"Van-Toan Phan, Van-Hung Nguyen, Van Dung Pham, Ngoc Thiem Le, Hung Thai Pham","doi":"10.53747/nst.v14i1.447","DOIUrl":"https://doi.org/10.53747/nst.v14i1.447","url":null,"abstract":"This work presents an in-house synthesis process of K2GdF5:Tb thermoluminescence (TL) powder by using the solid-state reaction method. The K2GdF5:Tb powder TL glow curves (called as TL spectra), responded to photons (i.e., X-ray beams, gammas) and neutrons, have been investigated to optimize the setting parameters of the TL reader. Batch homogeneity of the in-house synthesized K2GdF5:Tb powder has been investigated to study the feasibility in photon and neutron personal dosimetry. The batch homogeneity of the in-house synthesized K2GdF5:Tb powder was investigated as less than 27.0%, which satisfied the requirement of the IEC and the ISO criteria (maximum of 30.0% is acceptable).","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141679029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xuan Vinh Le, Ba Vu Chinh Nguyen, Viet Cuong Phan, Tai Dai Vo, Ngoc Dat Trinh, Thanh Khan Dinh, Van Din Nguyen
This report presents the findings of a study on the synthesis of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) using gamma Co-60 radiation in an aqueous solution saturated with N2 gas, containing 5 mM EDOT monomer and 0.2 M isopropanol. Gamma radiation with doses ranging from 12 kGy to 58 kGy from a gamma Co-60 source was employed. To assess the chemical composition of the solution before and after irradiation, UV-Vis and FTIR absorption spectra were examined. The results indicated the formation of yellow suspensions in the solution after irradiation, along with the emergence of dimers, oligomers, and PEDOT polymers as evidenced by UV-Vis spectra. The dried powders obtained from the irradiated solutions confirmed the successful synthesis of PEDOT, exhibiting distinct chemical structural characteristics in the FTIR spectra. These findings demonstrate the effective radiation-induced synthesis of conducting PEDOT polymer using gamma Co-60 irradiation.
{"title":"Synthesis of conducting polymer by gamma Co-60 ray in aqueous solution","authors":"Xuan Vinh Le, Ba Vu Chinh Nguyen, Viet Cuong Phan, Tai Dai Vo, Ngoc Dat Trinh, Thanh Khan Dinh, Van Din Nguyen","doi":"10.53747/nst.v13i4.442","DOIUrl":"https://doi.org/10.53747/nst.v13i4.442","url":null,"abstract":"This report presents the findings of a study on the synthesis of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) using gamma Co-60 radiation in an aqueous solution saturated with N2 gas, containing 5 mM EDOT monomer and 0.2 M isopropanol. Gamma radiation with doses ranging from 12 kGy to 58 kGy from a gamma Co-60 source was employed. To assess the chemical composition of the solution before and after irradiation, UV-Vis and FTIR absorption spectra were examined. The results indicated the formation of yellow suspensions in the solution after irradiation, along with the emergence of dimers, oligomers, and PEDOT polymers as evidenced by UV-Vis spectra. The dried powders obtained from the irradiated solutions confirmed the successful synthesis of PEDOT, exhibiting distinct chemical structural characteristics in the FTIR spectra. These findings demonstrate the effective radiation-induced synthesis of conducting PEDOT polymer using gamma Co-60 irradiation.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141269025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The bench unit, also known as the stationary magnetic particle system or the wet horizontal system, has been designed and fabricated to incorporate both circular and longitudinal magnetization techniques. Its primary purpose is to test machine parts commonly used in various industries, including aviation, automotive, and railway. The system comprises several key components: a transformer, a current control unit, a parameter display and adjustment circuit, a head shot, a coil, and wet magnetic irrigation device. This system is in compliance with international standards and is ready for implementation in companies that require it
{"title":"Designing and fabricating a stationary magnetic particle system for Non-destructive testing","authors":"Duc Thinh Le, Duc Huyen Nguyen, Xuan Thao Nguyen, Thi Kieu Oanh Ngo, Thanh Tung Pham, Minh Duc Nguyen, Thanh Tung Duong","doi":"10.53747/nst.v13i4.441","DOIUrl":"https://doi.org/10.53747/nst.v13i4.441","url":null,"abstract":"The bench unit, also known as the stationary magnetic particle system or the wet horizontal system, has been designed and fabricated to incorporate both circular and longitudinal magnetization techniques. Its primary purpose is to test machine parts commonly used in various industries, including aviation, automotive, and railway. The system comprises several key components: a transformer, a current control unit, a parameter display and adjustment circuit, a head shot, a coil, and wet magnetic irrigation device. This system is in compliance with international standards and is ready for implementation in companies that require it","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141388738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lan Nguyen Thi Kim, Thuan Nguyen Chi, Duy Nguyen Ngoc
Silver nanoparticles deposited on silica (Ag nano/SiO2) have been prepared by Co-60 gamma irradiation of the mixture Ag+/SiO2/H2O/ethanol. The reduction of Ag+ in the suspension of SiO2 is brought by e-aq and H· generated during the radiolysis of water/ethanol solution. The presence of SiO2 prevents agglomeration of Ag clusters. The conversion dose (Ag+® Ag0) was determined by UV-Vis spectroscopy. Transmission electron microscopy (TEM) characterized the size of Ag nanoparticles. As a result, the particle sizes were determined to be in the range of 5-20 nm for an Ag+ concentration of 5 mM. The crystal structure of silver nanoparticles was also investigated by X-ray diffraction (XRD). In addition, the antifungal activity of Ag nano/SiO2 was tested against Aspergillus niger var Tieghn by plate count method. The results indicated that the antifungal efficiency of Ag nano/SiO2 was about 64, 71, 81, 82, and 96% at the concentrations of Ag nanoparticles of 30, 50, 70, 100, and 150 ppm, respectively.
{"title":"Synthesis of silver nanoparticles embedded on silica by gamma irradiation for utilization as antimicrobial agents","authors":"Lan Nguyen Thi Kim, Thuan Nguyen Chi, Duy Nguyen Ngoc","doi":"10.53747/nst.v13i4.415","DOIUrl":"https://doi.org/10.53747/nst.v13i4.415","url":null,"abstract":"Silver nanoparticles deposited on silica (Ag nano/SiO2) have been prepared by Co-60 gamma irradiation of the mixture Ag+/SiO2/H2O/ethanol. The reduction of Ag+ in the suspension of SiO2 is brought by e-aq and H· generated during the radiolysis of water/ethanol solution. The presence of SiO2 prevents agglomeration of Ag clusters. The conversion dose (Ag+® Ag0) was determined by UV-Vis spectroscopy. Transmission electron microscopy (TEM) characterized the size of Ag nanoparticles. As a result, the particle sizes were determined to be in the range of 5-20 nm for an Ag+ concentration of 5 mM. The crystal structure of silver nanoparticles was also investigated by X-ray diffraction (XRD). In addition, the antifungal activity of Ag nano/SiO2 was tested against Aspergillus niger var Tieghn by plate count method. The results indicated that the antifungal efficiency of Ag nano/SiO2 was about 64, 71, 81, 82, and 96% at the concentrations of Ag nanoparticles of 30, 50, 70, 100, and 150 ppm, respectively.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141269002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tung Duong Thanh, Tan Hung Hoang, Hoang Tuan Truong, Chi Thanh Tran, H. Kikura
The decay heat removal by natural convection is very important in case of Station blackout (SBO) of nuclear reactor. The computational fluid dynamic (CFD) is helpful to simulate the flow and temperature field. However, the CFD simulation models need to be validated by the experimental data. Thus, in this report, the Anslys/Fluent is applied to simulate the natural convection induced by single heater rod. The vertical heated rod with a diameter of 12 mm and a length of 225 mm is immersed at the center of a vertical pipe made of acrylic with a diameter of 146 mm and a height of 500 mm. In this simulation, the coupled scheme algorithm is also applied. Regarding to experimental method, the optical method such as Particle Image Velocimetry (PIV) was applied for 2-dimensional velocity distribution and pointwise temperature measurement. As a result, the predicted flow and temperature field are well agreed with experimental data. Accordingly, the thermal plumes are well estimated by ANSYS/Fluent, in which the buoyant plumes induced by different temperatures vertically go up along the heater rod's upper part until the container's isolated upper wall. The complicated flow occurs in the middle part of the container by mixing the downward flow on the top and the upward flow from the heater rod.
{"title":"Simulation of natural convection flow for vertical heated rod by using ANSYS/Fluent","authors":"Tung Duong Thanh, Tan Hung Hoang, Hoang Tuan Truong, Chi Thanh Tran, H. Kikura","doi":"10.53747/nst.v13i4.453","DOIUrl":"https://doi.org/10.53747/nst.v13i4.453","url":null,"abstract":"The decay heat removal by natural convection is very important in case of Station blackout (SBO) of nuclear reactor. The computational fluid dynamic (CFD) is helpful to simulate the flow and temperature field. However, the CFD simulation models need to be validated by the experimental data. Thus, in this report, the Anslys/Fluent is applied to simulate the natural convection induced by single heater rod. The vertical heated rod with a diameter of 12 mm and a length of 225 mm is immersed at the center of a vertical pipe made of acrylic with a diameter of 146 mm and a height of 500 mm. In this simulation, the coupled scheme algorithm is also applied. Regarding to experimental method, the optical method such as Particle Image Velocimetry (PIV) was applied for 2-dimensional velocity distribution and pointwise temperature measurement. As a result, the predicted flow and temperature field are well agreed with experimental data. Accordingly, the thermal plumes are well estimated by ANSYS/Fluent, in which the buoyant plumes induced by different temperatures vertically go up along the heater rod's upper part until the container's isolated upper wall. The complicated flow occurs in the middle part of the container by mixing the downward flow on the top and the upward flow from the heater rod.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141268907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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