Tuan Anh Nguyen, Thanh Tam Dinh, Thi Minh Hue Dang
Using the Cornwall-Jackiw-Tomboulis formalism at finite temperature, we consider the phase transition of the aligned two Higgs doublet model in the two-loop double-bubble contribution. The results show that the system obeys a first-order phase transition.
{"title":"Phase Transition of Aligned two Higgs Doublets Model in the Cornwall-Jackiw-Tomboulis Formalism","authors":"Tuan Anh Nguyen, Thanh Tam Dinh, Thi Minh Hue Dang","doi":"10.53747/nst.v13i1.406","DOIUrl":"https://doi.org/10.53747/nst.v13i1.406","url":null,"abstract":"Using the Cornwall-Jackiw-Tomboulis formalism at finite temperature, we consider the phase transition of the aligned two Higgs doublet model in the two-loop double-bubble contribution. The results show that the system obeys a first-order phase transition.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140447916","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}
Tuan Anh Tran, Q. Tran, M. Ho, V. Ho, Van Cuong Trinh, Thi Tho Nguyen
The use of nuclear techniques for elemental analysis has been successfully developed in many laboratories in the IAEA Member States, including Vietnam. Nuclear techniques have also been proven to be extremely powerful in provenancing samples relevant to forensics. In the framework of the CRP project on Enhancing Nuclear Analytical Techniques to Meet the Needs of Forensic Sciences (IAEA CRP F11021), a total of 19 elemental concentrations in 48 car glass samples has been determined by the internal monostandard neutron activation analysis (IM-NAA) method. In this work, obtained results from the statical analysis indicated that rare earth elements (La, Ce, Sm, Eu, Tb, Yb), transition (Sc, Mn, Fe, Co, Zn) and major (Al, Na, Fe, Ca) elements play a significant role in the group study of car glasses.
{"title":"Application of internal mono standard neutron activation analysis method in elemental analysis of car glasses for forensic study","authors":"Tuan Anh Tran, Q. Tran, M. Ho, V. Ho, Van Cuong Trinh, Thi Tho Nguyen","doi":"10.53747/nst.v12i4.384","DOIUrl":"https://doi.org/10.53747/nst.v12i4.384","url":null,"abstract":"The use of nuclear techniques for elemental analysis has been successfully developed in many laboratories in the IAEA Member States, including Vietnam. Nuclear techniques have also been proven to be extremely powerful in provenancing samples relevant to forensics. In the framework of the CRP project on Enhancing Nuclear Analytical Techniques to Meet the Needs of Forensic Sciences (IAEA CRP F11021), a total of 19 elemental concentrations in 48 car glass samples has been determined by the internal monostandard neutron activation analysis (IM-NAA) method. In this work, obtained results from the statical analysis indicated that rare earth elements (La, Ce, Sm, Eu, Tb, Yb), transition (Sc, Mn, Fe, Co, Zn) and major (Al, Na, Fe, Ca) elements play a significant role in the group study of car glasses.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140448240","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}
Bui Ha, Tuấn Kiên Nguyễn, Dương Trần, Ngọc Toàn Trần, Quang Tuấn Hồ, Thu Trang Vũ
Image processing is one of the most important and widely used techniques in the medical field. Magnetic Resonance Imaging (MRI) can provide diagnostic images with high contrast and high resolution, especially for low-density tissue. Therefore, applications to support tumor prediction are researched and developed. In this paper, we use applied artificial intelligence to identify and detect tumors using the UNET ++ deep learning model, which achieved results with a recognition rate of about 80%. The results for a great deal of built-in functionality in the built-in physician support software system in practice.
{"title":"Development of Brain MRI Image Segmentation program using UNET++ network for radiosurgery planning","authors":"Bui Ha, Tuấn Kiên Nguyễn, Dương Trần, Ngọc Toàn Trần, Quang Tuấn Hồ, Thu Trang Vũ","doi":"10.53747/nst.v13i1.398","DOIUrl":"https://doi.org/10.53747/nst.v13i1.398","url":null,"abstract":"Image processing is one of the most important and widely used techniques in the medical field. Magnetic Resonance Imaging (MRI) can provide diagnostic images with high contrast and high resolution, especially for low-density tissue. Therefore, applications to support tumor prediction are researched and developed. In this paper, we use applied artificial intelligence to identify and detect tumors using the UNET ++ deep learning model, which achieved results with a recognition rate of about 80%. The results for a great deal of built-in functionality in the built-in physician support software system in practice.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140448672","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}
Anh Quoc Le, Van Phu Dang, Ngoc Duy Nguyen, Chi Thuan Nguyen, Q. Nguyen, Dai Nghiep Ngo
In this study, Maillard reaction with glucosamine (GA) induced by gamma irradiation was applied for chitosan (CT) and oligochitosan (OC) to improve the solution stability and antibacterial activity under alkaline condition. The mixture solutions of CT and/or OC with GA were irradiated at the dose of 25 kGy to form the Maillard reaction products (MRPs) respectively. The formations of MRPs were determined by spectrophotometric analyses at the wavelength of 284 nm and 420 nm. The improvement effect caused by the Maillard reaction on the stability of CT and OC solutions in alkaline condition was evaluated through the increase of pH value at the precipitation point of the solutions before and after irradiation. The antibacterial activity of the solutions against Escherichia coli was also investigated. The results showed that the CT-GA MRPs and OC-GA MRPs solutions could be remain their stability at pH 7, and the pH values at the precipitation point were 7.4 and 11.5 respectively. Moreover, at pH 7, the MRPs solutions exhibited high antibacterial activity with the reduction of ~ 4 log CFU/ml over control sample. Furthermore, 5-hydroxymethylfurfural (5-HMF), a known cytotoxic product formed by heat-induced Maillard reaction was not detected in both irradiated CT-GA and OC-GA solution. These results prove that the irradiation-induced Maillard reaction is an effective strategy to modify chitosan, and the MPRs of CT/OS with GA had a great potential to replace synthesis additives as a natural preservative for food applications
{"title":"Irradiation-induced Maillard reaction with glucosamine: an advance strategy to modify chitosan","authors":"Anh Quoc Le, Van Phu Dang, Ngoc Duy Nguyen, Chi Thuan Nguyen, Q. Nguyen, Dai Nghiep Ngo","doi":"10.53747/nst.v12i4.385","DOIUrl":"https://doi.org/10.53747/nst.v12i4.385","url":null,"abstract":"In this study, Maillard reaction with glucosamine (GA) induced by gamma irradiation was applied for chitosan (CT) and oligochitosan (OC) to improve the solution stability and antibacterial activity under alkaline condition. The mixture solutions of CT and/or OC with GA were irradiated at the dose of 25 kGy to form the Maillard reaction products (MRPs) respectively. The formations of MRPs were determined by spectrophotometric analyses at the wavelength of 284 nm and 420 nm. The improvement effect caused by the Maillard reaction on the stability of CT and OC solutions in alkaline condition was evaluated through the increase of pH value at the precipitation point of the solutions before and after irradiation. The antibacterial activity of the solutions against Escherichia coli was also investigated. The results showed that the CT-GA MRPs and OC-GA MRPs solutions could be remain their stability at pH 7, and the pH values at the precipitation point were 7.4 and 11.5 respectively. Moreover, at pH 7, the MRPs solutions exhibited high antibacterial activity with the reduction of ~ 4 log CFU/ml over control sample. Furthermore, 5-hydroxymethylfurfural (5-HMF), a known cytotoxic product formed by heat-induced Maillard reaction was not detected in both irradiated CT-GA and OC-GA solution. These results prove that the irradiation-induced Maillard reaction is an effective strategy to modify chitosan, and the MPRs of CT/OS with GA had a great potential to replace synthesis additives as a natural preservative for food applications","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139958327","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}
Thi My Linh Dang, Ngoc Quynh Nguyen, Duc-Ky Bui, Thi Nhung Duong, Quang Tuan Ho, Van Trieu Duong, Thanh Ha Tran, Thi Anh Duong Bui, Bao Ngoc Pham
This paper presents the characteristics of the reference X-ray narrow-spectrum series used in the Secondary Standard Dosimetry Laboratory (SSDL) at Institute for Nuclear Science and Technology (INST) with X-ray beam irradiator. In order to perform calibration works, it is highly important to verify the characteristics and qualities of reference X-ray beam recommended by the International Standardization Organization (ISO) 4037:2019. The characteristics of the X-ray beams in terms of the half-value layer, homogeneity coefficient and the air kerma rate are determined for the narrow-spectrum series in the 40 and 150 keV range. The related dosimetric quantities such as the ambient dose equivalent and personal dose equivalent also determined. The experimental values are well consistent with the recommended values of the ISO 4037 criteria. It implies that the reference X-ray narrow-spectrum series (N-series) can be applied in calibration works of X-ray measuring devices used in radiation safety assessment.
本文介绍了核科学与技术研究所二级标准剂量测定实验室（SSDL）使用的 X 射线束辐照装置的参考 X 射线窄谱系列的特性。为了进行校准工作，验证国际标准化组织（ISO）4037:2019 推荐的参考 X 射线束的特性和质量非常重要。针对 40 和 150 千伏范围内的窄光谱系列，确定了 X 射线束在半值层、均匀性系数和空气开玛率方面的特性。同时还测定了相关的剂量测定量，如环境剂量当量和个人剂量当量。实验值与 ISO 4037 标准的推荐值完全一致。这意味着参考 X 射线窄谱系列（N 系列）可用于辐射安全评估中 X 射线测量设备的校准工作。
{"title":"Characteristics of the reference X-ray narrow-spectrum series at SSDL of Institute for Nuclear Science and Technology","authors":"Thi My Linh Dang, Ngoc Quynh Nguyen, Duc-Ky Bui, Thi Nhung Duong, Quang Tuan Ho, Van Trieu Duong, Thanh Ha Tran, Thi Anh Duong Bui, Bao Ngoc Pham","doi":"10.53747/nst.v12i4.387","DOIUrl":"https://doi.org/10.53747/nst.v12i4.387","url":null,"abstract":"This paper presents the characteristics of the reference X-ray narrow-spectrum series used in the Secondary Standard Dosimetry Laboratory (SSDL) at Institute for Nuclear Science and Technology (INST) with X-ray beam irradiator. In order to perform calibration works, it is highly important to verify the characteristics and qualities of reference X-ray beam recommended by the International Standardization Organization (ISO) 4037:2019. The characteristics of the X-ray beams in terms of the half-value layer, homogeneity coefficient and the air kerma rate are determined for the narrow-spectrum series in the 40 and 150 keV range. The related dosimetric quantities such as the ambient dose equivalent and personal dose equivalent also determined. The experimental values are well consistent with the recommended values of the ISO 4037 criteria. It implies that the reference X-ray narrow-spectrum series (N-series) can be applied in calibration works of X-ray measuring devices used in radiation safety assessment.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140447234","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}
Chau Nguyen Thanh, Thao Huong Giang Le, Ngoc Nhat Anh Nguyen, Van Chuan Nguyen, Tien Thanh Pham
Gamma scanning technique is known to be an effective method for survey the condition of distillation columns in petrochemical refineries and has been widely applied. The result of the gamma scanning is a 1-dimensional graph showing the transmittance counts according to the height of the column. To illuminate the important phenomena occurring on the tray such as foaming; flooding; weeping due to valve failure on the tray needs experienced people and the interpretation results are still quite qualitative. The method of 2-D gamma scanning and reconstruction (2D Tomography), which has just appeared in the world in recent years, is considered as a potential method to help detect the above phenomena. This report presents the two-dimensional gamma scanning configuration, mathematical calculation and noise processing methods by using the combination of Xiaolin Wu’s line drawing algorithm with simultaneous algebraic reconstruction algorithm (SART) based on data from Monte Carlo simulation.
{"title":"Study of image reconstruction method for 2D gamma scan technique by anti-aliasing line \"Xiaolin Wu\" algorithm combined with simultaneous algebraic reconstruction algorithms and testing on MCNP simulation data","authors":"Chau Nguyen Thanh, Thao Huong Giang Le, Ngoc Nhat Anh Nguyen, Van Chuan Nguyen, Tien Thanh Pham","doi":"10.53747/nst.v12i4.397","DOIUrl":"https://doi.org/10.53747/nst.v12i4.397","url":null,"abstract":"Gamma scanning technique is known to be an effective method for survey the condition of distillation columns in petrochemical refineries and has been widely applied. The result of the gamma scanning is a 1-dimensional graph showing the transmittance counts according to the height of the column. To illuminate the important phenomena occurring on the tray such as foaming; flooding; weeping due to valve failure on the tray needs experienced people and the interpretation results are still quite qualitative. The method of 2-D gamma scanning and reconstruction (2D Tomography), which has just appeared in the world in recent years, is considered as a potential method to help detect the above phenomena. This report presents the two-dimensional gamma scanning configuration, mathematical calculation and noise processing methods by using the combination of Xiaolin Wu’s line drawing algorithm with simultaneous algebraic reconstruction algorithm (SART) based on data from Monte Carlo simulation.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140448045","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}
Thanh Minh Pham, Phuoc Minh Thanh Mai, Thi Mai Huong Le, Van Phuc Phan
Systems for targeted drug delivery in the treatment of cancer using nanoparticles are currently of interest to many domestic and foreign scientists. In this work, for application as a target drug delivery system in the treatment of breast cancer Fe3O4@lapatinib nanoparticles were prepared by coprecipitation of solutions of Fe2+ and Fe3+ salts in alkaline, followed by purification in a magnetic separation system. Physicochemical properties of nanoparticles were studied and determined by XRD, TEM, DLS, HPLC, VSM, AAS and zeta potential methods. The results showed that the size of Fe3O4@lapatinib nanoparticles is in the range of 10 to 40 nm, hydrodynamic diameter is 27.4 ± 0.6 nm, saturation magnetization is 39.1 ± 3.1 emu/g, Fe content is 16.35 ± 0.97 mg/ml, lapatinib content is 8.08 ± 0.06 mg/ml, and the zeta potential is -16.2 ± 1.3 mV. Thus, the obtained Fe3O4@lapatinib nanoparticles are fully suitable for targeted drug delivery in the breast cance treatment
{"title":"Study on preparation of Fe₃O₄@lapatinib nanoparticles for application as a targeted drug delivery system in the treatment of breast cancer","authors":"Thanh Minh Pham, Phuoc Minh Thanh Mai, Thi Mai Huong Le, Van Phuc Phan","doi":"10.53747/nst.v13i1.410","DOIUrl":"https://doi.org/10.53747/nst.v13i1.410","url":null,"abstract":"Systems for targeted drug delivery in the treatment of cancer using nanoparticles are currently of interest to many domestic and foreign scientists. In this work, for application as a target drug delivery system in the treatment of breast cancer Fe3O4@lapatinib nanoparticles were prepared by coprecipitation of solutions of Fe2+ and Fe3+ salts in alkaline, followed by purification in a magnetic separation system. Physicochemical properties of nanoparticles were studied and determined by XRD, TEM, DLS, HPLC, VSM, AAS and zeta potential methods. The results showed that the size of Fe3O4@lapatinib nanoparticles is in the range of 10 to 40 nm, hydrodynamic diameter is 27.4 ± 0.6 nm, saturation magnetization is 39.1 ± 3.1 emu/g, Fe content is 16.35 ± 0.97 mg/ml, lapatinib content is 8.08 ± 0.06 mg/ml, and the zeta potential is -16.2 ± 1.3 mV. Thus, the obtained Fe3O4@lapatinib nanoparticles are fully suitable for targeted drug delivery in the breast cance treatment","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140449063","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}
Thi Thanh Nga Nguyen, Nhu Sieu Le, Bich Thuy Nguyen
An annual effective dose evaluation from Dong Nai surface soil (45 samples) to humans was carried out in this work. ResRad-Onsite software has been applied to estimate the maximum exposure dose by considering different exposure levels across an area of 5905.7 km2 with a topsoil thickness of 20 cm. The calculation grid used in ResRad Onsite software is divided in the form of a circle of radius 3, 5, 10, 20, and 30 km, respectively, calculated from the circle center in terms of 16 wind directions. A high-purity germanium detector (HPGe) was used to determine 238U, 232Th, 226Ra, 137Cs, and 40K isotopes. The range activity concentrations of them were found to be 6.46 ÷ 48.11; 13.95 ÷ 58.75; 5.71 ÷ 35.27; 0.15 ÷ 1.23 and 6.7 ÷ 222; mBq/g, respectively. The isotope 239,240Pu was determined by the radiochemical separation method, measured on the alpha spectrometer system, and the calculated value range is 0.009 ÷ 0.073 mBq/g. The activity of 90Sr was determined by separation technique, measured on a low-background alpha/beta total counting system (MPC 9300) with a calculated value range of 0.10 ÷ 0.83 mBq/g. By ResRad-Onsite code, the external effective dose derived from the ground (excluding Radon’s contribution) is calculated to be 170 ÷ 658 µSv/year with an average value is 368.6 µSv/year. The external dose from the soil is 136.5 µSv/year (accounting for 37%). The results showed that the annual radiation dose distribution derived from the ground equivalent to the average of some different regions in the territory of Vietnam and the world. In addition, the external effective dose from the ResRad-Onsite code tended to be about 1.36 times smaller than the practical measured due to the library’s different dose conversion coefficients.
{"title":"Effective dose evaluation for external exposure from surface soil by using resrad-onsite code","authors":"Thi Thanh Nga Nguyen, Nhu Sieu Le, Bich Thuy Nguyen","doi":"10.53747/nst.v13i1.403","DOIUrl":"https://doi.org/10.53747/nst.v13i1.403","url":null,"abstract":"An annual effective dose evaluation from Dong Nai surface soil (45 samples) to humans was carried out in this work. ResRad-Onsite software has been applied to estimate the maximum exposure dose by considering different exposure levels across an area of 5905.7 km2 with a topsoil thickness of 20 cm. The calculation grid used in ResRad Onsite software is divided in the form of a circle of radius 3, 5, 10, 20, and 30 km, respectively, calculated from the circle center in terms of 16 wind directions. A high-purity germanium detector (HPGe) was used to determine 238U, 232Th, 226Ra, 137Cs, and 40K isotopes. The range activity concentrations of them were found to be 6.46 ÷ 48.11; 13.95 ÷ 58.75; 5.71 ÷ 35.27; 0.15 ÷ 1.23 and 6.7 ÷ 222; mBq/g, respectively. The isotope 239,240Pu was determined by the radiochemical separation method, measured on the alpha spectrometer system, and the calculated value range is 0.009 ÷ 0.073 mBq/g. The activity of 90Sr was determined by separation technique, measured on a low-background alpha/beta total counting system (MPC 9300) with a calculated value range of 0.10 ÷ 0.83 mBq/g. By ResRad-Onsite code, the external effective dose derived from the ground (excluding Radon’s contribution) is calculated to be 170 ÷ 658 µSv/year with an average value is 368.6 µSv/year. The external dose from the soil is 136.5 µSv/year (accounting for 37%). The results showed that the annual radiation dose distribution derived from the ground equivalent to the average of some different regions in the territory of Vietnam and the world. In addition, the external effective dose from the ResRad-Onsite code tended to be about 1.36 times smaller than the practical measured due to the library’s different dose conversion coefficients.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140448395","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}
Bui Ha, Duy Dang Nguyen The, Hoang Nguyen Tuan, Trang Vu Thu, Hai Lai Viet
Gamma camera is an imaging technique that captures gamma radiation emitting from the radiation sources. In this paper, the authors built a Mini-Gamma camera system using a micro photomultiplier tube (µPMT) H12700, signal processing circuit, and control software as self-designed products. The Gamma camera system includes four parts: collimator, scintillator NaI(Tl), µPMT, processing, and controller boards. The electronic system had preamplifiers used to convert negative signals from the µPMT to positive signals, integrators used to sharpen the signal from the preamplifier, and an amplifier circuit to amplify the signal from the preamplifier, a position detection circuit to detect the location of radiation interaction in the crystal. All circuits in the Mini-Gamma camera system are optimized to achieve the best projection image quality. In this paper, the lab-built Mini-Gamma Camera has an energy resolution of 45% at 60 keV gamma rays, the affected field of the camera is 42×48.5 mm2, and the spatial resolution of the image is around 1 mm.
{"title":"Research and manufacture of the mini gamma camera using multi-anode photo multiplier tube (Ma-PMT)","authors":"Bui Ha, Duy Dang Nguyen The, Hoang Nguyen Tuan, Trang Vu Thu, Hai Lai Viet","doi":"10.53747/nst.v12i4.375","DOIUrl":"https://doi.org/10.53747/nst.v12i4.375","url":null,"abstract":"Gamma camera is an imaging technique that captures gamma radiation emitting from the radiation sources. In this paper, the authors built a Mini-Gamma camera system using a micro photomultiplier tube (µPMT) H12700, signal processing circuit, and control software as self-designed products. The Gamma camera system includes four parts: collimator, scintillator NaI(Tl), µPMT, processing, and controller boards. The electronic system had preamplifiers used to convert negative signals from the µPMT to positive signals, integrators used to sharpen the signal from the preamplifier, and an amplifier circuit to amplify the signal from the preamplifier, a position detection circuit to detect the location of radiation interaction in the crystal. All circuits in the Mini-Gamma camera system are optimized to achieve the best projection image quality. In this paper, the lab-built Mini-Gamma Camera has an energy resolution of 45% at 60 keV gamma rays, the affected field of the camera is 42×48.5 mm2, and the spatial resolution of the image is around 1 mm.","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140448569","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}
Phonesavanh Lathdavong, Ho Manh Dung, Hồ Văn Doanh, T. Q. Thiện, Trương Trường Sơn
In this study, the k0 factors of 7 short and medium-lived radionuclides (i.e. 66Cu, 52V, 38Cl, 134mCs, 128I, 140La and 56Mn) were experimentally determined at the Dalat nuclear research reactor (DNRR). The synthetic multi-element standard (SMELS) samples were irradiated at Channel 7-1 installed at the DNRR. SMELS Type III contains Au and Zr, thus also allowing the self-characterization of the irradiation facility (i.e. the direct determination of f and a with only this material). The k0 factors of 7 short and medium-lived radionuclides obtained in this work are a good agreement with the reference k0 factors. The ratio values between the experimental and reference k0 values were 66Cu of 1.004, 52V of 1.004, 38Cl of 0.961 and 0.976 (1642.7 keV and 2167.4keV, respectively), 134mCs of 0.831, 128I of 1.022, 140La of 0.936, 0.955 and 0.955 (328.8 keV, 487.0 keV and 1596.2keV, respectively), 56Mn of 0.985 and 0.973 (846.8 keV and 1810.7keV, respectively). The radionuclides range of uncertainty values were lower than 7%. The present result indicates that the k0 factors can be determined by using synthetic multi-element standards (SMELS).
本研究在达叻核研究反应堆（DNRR）对 7 种中短寿命放射性核素（即 66Cu、52V、38Cl、134mCs、128I、140La 和 56Mn）的 k0 因子进行了实验测定。合成多元素标准（SMELS）样品在达叻核研究反应堆安装的 7-1 频道进行辐照。SMELS III 型含有金和锆，因此也允许对辐照设施进行自我表征（即只用这种材料直接测定 f 和 a）。这项工作获得的 7 种中短寿命放射性核素的 k0 因子与参考 k0 因子非常吻合。实验值与参考 k0 值的比值分别为：66Cu 为 1.004、52V 为 1.004、38Cl 为 0.961 和 0.976（分别为 1642.7 keV 和 2167.4 keV）、134mCs 为 0.831、128I 为 1.831（分别为 1642.7 keV 和 2167.4 keV）。831, 128I of 1.022, 140La of 0.936, 0.955 and 0.955 (分别为 328.8 keV, 487.0 keV and 1596.2 keV), 56Mn of 0.985 and 0.973 (分别为 846.8 keV and 1810.7 keV)。放射性核素的不确定值范围均低于 7%。本结果表明，使用合成多元素标准（SMELS）可以确定 k0 因子。
{"title":"Self-characterization of irradiation facility using synthetic multi-element standard for determination of k0-factors of seven radionuclides of interest","authors":"Phonesavanh Lathdavong, Ho Manh Dung, Hồ Văn Doanh, T. Q. Thiện, Trương Trường Sơn","doi":"10.53747/nst.v13i1.402","DOIUrl":"https://doi.org/10.53747/nst.v13i1.402","url":null,"abstract":"In this study, the k0 factors of 7 short and medium-lived radionuclides (i.e. 66Cu, 52V, 38Cl, 134mCs, 128I, 140La and 56Mn) were experimentally determined at the Dalat nuclear research reactor (DNRR). The synthetic multi-element standard (SMELS) samples were irradiated at Channel 7-1 installed at the DNRR. SMELS Type III contains Au and Zr, thus also allowing the self-characterization of the irradiation facility (i.e. the direct determination of f and a with only this material). The k0 factors of 7 short and medium-lived radionuclides obtained in this work are a good agreement with the reference k0 factors. The ratio values between the experimental and reference k0 values were 66Cu of 1.004, 52V of 1.004, 38Cl of 0.961 and 0.976 (1642.7 keV and 2167.4keV, respectively), 134mCs of 0.831, 128I of 1.022, 140La of 0.936, 0.955 and 0.955 (328.8 keV, 487.0 keV and 1596.2keV, respectively), 56Mn of 0.985 and 0.973 (846.8 keV and 1810.7keV, respectively). The radionuclides range of uncertainty values were lower than 7%. The present result indicates that the k0 factors can be determined by using synthetic multi-element standards (SMELS).","PeriodicalId":19445,"journal":{"name":"Nuclear Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140447779","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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