Truong Thi Hong Loan, Vu Ngoc Ba, Dang Thi Thuy Dan, Vuong Minh Tri, Huynh Thi Yen Hong, Truong Huu Ngan Thy, Nguyen Thi Truc Linh, Le Cong Hao & Huynh Truc Phuong
Journal of Radioanalytical and Nuclear Chemistry 327, 609-616(2021)
Abstract:
In this work, the impacts of TENORM (Technologically Enhanced Naturally Occurring Radioactive Materials) from fertilizers on soil and vegetables were estimated. We investigated both the activity concentration of the natural radionuclides and the annual effective dose rate due to the ingestion of vegetables in the crops using fertilizers at the agricultural zone of Hoc Mon, Ho Chi Minh City, Vietnam. The results show that there have not yet been signs of radioactive residues from using conventional fertilizers in agricultural land after a crop at the surveyed area and time. The radiological impact of surveyed vegetables was negligible to the public health.
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Nguyen Le Anh , Nguyen Hoang Phuc , Dao T. Khoa , Le Hoang Chien , Nguyen Tri Toan Phuc
Nuclear Physics A 1006 (2021) 122078
Abstract:
The proton radiative capture 12,13C(p, γ ) reactions at astrophysical energies, key processes in the CNO cycle, are revisited in the potential model with the proton-nucleus potential for both the scattering and bound states obtained in the folding model, using a realistic density dependent nucleon-nucleon interaction. For the consistency, this same folding model is also used to calculate the optical potential of the elastic p+12,13C scattering at energies around the Coulomb barrier. The folded p+12,13C optical potentials are shown to account well for both the elastic p+12,13C scattering and astrophysical S factors of the radiative capture 12,13C(p, γ ) reactions.
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Yu Nakazawa, Tai Thanh Chau, Yuki Fuji, Masahiro Ikeno, Satoshi Mihara, Masayoshi Shoji, Tomohisa Uchida, Kazuki Ueno, Myeong Jae Lee
Proceedings of Science, European Physical Society Conference on High Energy Physics - EPS-HEP2019 - 10-17 July, 2019
Abstract:
The COMET Phase-I experiment searches for a neutrinoless muon-to-electron conversion which has never been observed yet. The world’s highest intensity muon beam is applied, and it leads to an unacceptable trigger rate of O (106 ) Hz. For stable data collection, the trigger rate must be reduced to O(103)Hz. This requirement is met using online event classification in the detector system which holds 99% of signal events. This classification is performed by an FPGA-based trigger system, and its processing time is set to less than 5μs by a buffer size of the detector readout electronics. A prototype board for the trigger system was developed, and communica- tion systems for related electronics devices were also constructed. From test results, the total processing time is estimated to be 2.8 μ s , which meets the requirement. We have also devel- oped an online self-trigger system for cosmic-rays and confirmed the feasibility of this hardware logic. The trigger electronics were installed in a setup for cosmic-ray measurement, and the data acquisition was successfully done using the self-trigger system.
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Evaluating coincidence summing factor using marinelli beaker on coaxial HPGe detector by Monte Carlo simulation and calculating
Le Hoang Minh, Le Quang Vuong, Tran Thien Thanh, Chau Van Tao
Nucl. Sci. and Tech., Vol.12, No. 1 (2022), pp. 49-55
Abstract:
This investigation aims to compare the full energy peak efficiencies in the energy range of 46-1836 keV on a type-p coaxial HPGe and estimate the coincidence summing factor for the case of Marinelli Beaker samples used by two general Monte-Carlo simulation software MCNP and PENELOPE. The radioactive nuclides used in determining the coincidence summing factor include 22Na, 60Co, 88Y, 133Ba, 134Cs, 154Eu, and 208Tl, which are prepared in HCl 2M solution and contained in a Marinelli beaker with the source’s volume of 3000 ml. The results demonstrate there is a good agreement between the two simulation software with an average discrepancy of 1.3%. On the other hand, the simulation coincidence summing factor values are also compared with the results from the calculating software ETNA with an average discrepancy of approximately 3.1%.
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Bui Ngoc Thien, Vu Ngoc Ba, Nguyen Thi Thao Vy, Truong Thi Hong Loan
Chemosphere Volume 259, November 2020, 127432
Abstract:
In this study, soil-to-plant transfer factor and annual organ equivalent dose due to ingestion of natural radionuclides in 13 popular food crop samples in Ho Chi Minh city, Vietnam were estimated. The obtained data show that the radioactive elements transported from soil to plants play an essential role as indicators for the nutritional needs of plant and the ability to accumulate radioisotopes and heavy metal elements for environmental decontamination. It is found that B. alba and C. gigantean is useful for decontamination of high content potassium in soil, otherwise, P. fruticosa and C. gigantean may be used for soil with high concentration of 210Pb and 226Ra. In addition, biological effects of the plant ingestion in human body were assessed. The doses due to ingestion of food crop samples varied from organ to organ, depending on the organotrophic properties of the radionuclides. For examples, equivalent dose for 40K in large intestine is higher than other organs. In contrast, equivalent dose for 238U, 226Ra, 210Pb and 232Th were mostly at bone surface. In general, the obtained dose values of lower than the average value recommended by UNSCEAR for food crop ingestion pose no threat to the public’s health. However, close investigations are needed in the near future.
Establishment of an experimental system for X-ray fluorescence analysis with excitation using 3H/Zr source: Evaluation and applications
Van Thi Thu Trang, Nguyen Van Hanh, Huynh Truc Phuong
Spectrochimica Acta Part B: Atomic Spectroscopy 205 (2023) 106694
Abstract:
The goal of this study is to establish and assess an experimental apparatus for X-ray fluorescence analysis with elemental excitation in materials using a 3H/Zr source. The limits of detection and quantification, as well as analytical sensitivity, were estimated using a linear curve methodology. Furthermore, accuracy and precision were assessed by quantitatively analyzing the components of the reference material. The limits of detection and quantification of elements such as S, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Ta, and Pb were estimated to range from 3.7 mg kg-1 to 573 mg kg-1, depending on the analyte. Analytical sensitivities were found to be between 1.2 and 867 cps/%. The measured elemental concentrations in the reference sample were compared with the inductively coupled plasma mass spectrometry method, and all bias (%) values were found to be lower than 10%. This study also determined the levels of Ca, Ti, Mn, and Fe in cement and K, Ca, Cr, Mn, Fe, and Zn in tea leaves. The results showed that the 3H/Zr source could detect and quantify components at concentrations of a few mg kg-1 or higher. X-ray fluorescence spectrometry is suggested for the analysis of the concentration of various elements in environmental, geological, food, and other samples.
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