An improved semi-empirical procedure for Compton scattering technique applied to measure pipeline thickness
Vo Hoang Nguyen, Nguyen Huu Bao, Huynh Dinh Chuong, Nguyen Duy Thong, Tran Thien Thanh & Chau Van Tao
Journal of Radioanalytical and Nuclear Chemistry (2021)
Abstract:
This study aims to formulate semi-empirical processing applied to analyze simulated and experimental scattering spectra on pipeline samples for estimating the intensity of the single scattering component for the Compton scattering technique. Firstly, a procedure has been developed based on probability density functions of each scattering component, which are obtained by GEANT4. Secondly, sixteen targets are simulated with MCNP6 to validate the proposed procedure. It is shown that the relative deviation for all samples is under 3%. Thirdly, the nine calculated thickness of pipeline samples is determined with a maximum relative deviation lower than 5% in comparing to calibration thickness.
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AMBIGUITIES FROM NUCLEAR INTERACTIONS IN THE 12C(p,2p)11B REACTION
Nguyen Tri Toan Phuc, Kazuyuki Ogata, Nguyen Hoang Phuc, Bui Duy Linh, Vo Hong Hai and Le Xuan Chung
Communications in Physics, Vol. 32, No. 2 (2022), pp. 117-132
Abstract:
We investigate the impact of ambiguities coming from the choice of optical potentialsand nucleon-nucleon scattering cross sections on the spectroscopic factors extracted from the 12C( p,2p)11B reaction. These ambiguities are evaluated by analyzing the cross sections of the 12C( p,2p)11B reaction at 100 and 200 MeV within the framework of the distorted-wave impulseapproximation with realistic choices of nuclear inputs. The results show that the studied ambigui-ties are considerably large in this energy region and careful choices of nuclear inputs used in thereaction calculations are required to extract reliable structure information
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Activity Concentrations of Natural Radionuclides in Soil and Water Around Some Quarries and Potential Human Health Effects
Le Binh An, Van Thang Nguyen, Nguyen Phong Thu Huynh, Huynh Thi Yen Hong, Truong Huu Ngan Thy, Huynh Truc Phuong, Cong Hao Le
Water Air Soil Pollut (2023) 234:122
Abstract:
In this study, radioactivity levels were measured in surface soil and water around some large quarries and quarry lakes in Binh Duong Province, Vietnam. Natural radionuclides (226Ra, 232Th, and 40K) in the collected soil and water samples were analyzed by gamma spectroscopy equipped with a high-purity germanium (HPGe) detector. A method was introduced to assess the radiological risks to the local population. It was based on the effective dose that was estimated by a sum of the individual doses. Some major exposure pathways including (1) external exposure by gamma rays, (2) internal exposure by drinking water, and (3) internal exposure by ingestion of food crops and fishes in the area were considered. For the estimation of natural radioactivity in other relevant environments such as food crops and fish, some estimation models based on soil-to-crops transfer factors and water-to-fish concentrations ratios were used. It was found that most of the radioactivity levels in soil and water were within the ranges of the concentrations in the world and Vietnam. The effective dose due to the ingestion of food exceeds the recommended limitation of 300 μSv y−1. However, the ingestion dose was estimated with the assumption that the ingestion rate is the average rate of people in the study area.
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Vu Ngoc Ba, Van Thang Nguyen, Bui Ngoc Thien, Huynh Nguyen Phong Thu, Truong Thi Hong Loan
Journal of Radioanalytical and Nuclear Chemistry
Abstract:
The aim of this study is to determine activity concentrations of natural radionuclides (226Ra, 232Th, 40K and 222Rn) and radiological risks due to the contamination of radionuclides in surface soil in Ho Chi Minh City, Vietnam. Based on the activity concentration of 226Ra in the surface soil, we proposed a method for estimation of the radon concentration in the indoor air. The assessments of radiation dose and excess lifetime cancer risk show that the utilization of surface soils for human residences or routine activities in the studied area poses no risk to the public health.
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Le Hong Khiem, Koichiro Sera, Takako Hosokawa, Le Dai Nam, Nguyen Huu Quyet, Marina Frontasyeva, Trinh Thi Thu My, Nguyen Thi Bao My, Inga Zinicovscaia, Nguyen The Nghia, Trinh Dinh Trung, Khuat Thi Hong, Nguyen Ngoc Mai, Duong Van Thang, Nguyen An Son, Tran Thien Thanh, Sonexay Xayheungsy
Journal of Radioanalytical and Nuclear Chemistry(2020)
Abstract:
For the rst time, the active moss biomonitoring technique has been used in Vietnam for investigation of atmospheric elemental contamination in the air of Hanoi region. The Sphagnum girgensohnii moss harvested in the clean area were used to produce the moss-bags.After 2 months of expose in 45 di erent sites in Hanoi area, the moss samples were prepared and the concentration of 27 heavy metal elements were determined by proton induced X-ray emission at Cyclotron Research Center of Iwate Medical University (Japan).The comparison of the obtained results with those in several cities in Europe shows that Hanoi’s air pollution of heavy metal is much more serious. Based on the values of contamination coe cient, it is shown that Hanoi’s air is extremely polluted by Co; seriously polluted by V and Se; moderately polluted by Cl, Cr, As, Br, Zr, Nb, Mo and Hg; slightly polluted by Mg, Al, Si, K, Ca, Ti, Fe, Cu, Zn, Ga, Rb, Sr, Mo, Ba, W and Pb Statistical analysis has been applied to the original concentration data of the detected elements to nd the possible pollution sources.
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Van Thang Nguyen, Nguyen Phong Thu Huynh, Cong Hao Le
Journal of Environmental Management 271 (2020) 111001
Abstract:
In topsoils, the activity concentrations of natural radionuclides (hereafter NRs) increase due to the addition of NRs from fertilizers, irrigation water, and air dust pollution. On the other hand, various physical-chemical and environmental processes such as radioactive decay, volatilization, leaching, erosion, and plant uptake were responsible for the decrease of the activity concentrations of NRs in the topsoils. In this study, behaviours of 40K, 210Pb, 226Ra, 238U, and 232Th in topsoils were modelled by the CEMC soil model and the HYDRUS-1D model. An exponential equation was proposed for estimating the accumulation rates of these radionuclides in the topsoils. Long-term accumulation of radionuclides was assessed for water spinach (Ipomoea Aquatica Forssk.) soil (here-after VES) and rice (Oryza sativa L.) soil (hereafter RIS). We found that the current agricultural practices caused the increase of 40K activity concentration in the water spinach soil, and 40K, 210Pb, 226Ra, and 232Th activity concentrations in the rice soil. The accumulation rates of radionuclides were in the order 238U <232Th <226Ra <210Pb <40K. 25 years of cultivation with water spinach can increase/decrease +(165 +/- 6) Bq of 40K, – (8.2 +/-0.7) Bq of 210Pb, – (4.3 +/-0.2) Bq of 226Ra, – (7 0.3 +/-0.3) Bq of 238U, and – (1.8 +/-0.1) Bq of 232Th in 1 kg soil. For rice cultivation, these values are +(1004 +/-39), +(3.3 +/-0.2), +(3.0 +/-0.2), – (5.1 +/-0.3), (2.2 +/-0.1) Bq kg-1 for 40K, 210Pb, 226Ra, 238U, and 232Th, respectively.
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