Analysis of the soil to food crops transfer factor and risk assessment of multi-elements at the suburban area of Ho Chi Minh city, Vietnam using instrumental neutron activation analysis (INAA)
Bui Ngoc Thien, Vu Ngoc Ba, Mai Thanh Man, Truong Thi Hong Loan
Journal of Environmental Management 291 (2021) 112637
Abstract:
The contamination of heavy metals in agricultural ecosystem is one of the most important problems in devel- oping countries as Vietnam. In this study, we investigated the multi-element concentrations in soil, vegetables, soil-to-plant transfer factors and target hazard quotient (THQ) due to the consumption of heavy metals in Ho Chi Minh City, Vietnam. In general, the element concentrations in soil and plants were similar to different studies in the world and in the range of allowable values provided by WHO and the Ministry of Health of Vietnam. The transfer factors indicated the in uence of element characteristics and plant genotypes on the accumulation and translocation of elements from soil to plants. It is found that I. batatas, B. alba, A, tricolor, O. basilicum, and B. juncea could be potential candidates for phytoremediation in soil contaminated of heavy metals. The results of individual and total THQ were below unity for Cr, Mn, Fe, Co, Zn, As, and Sb. The total THQ is in the range from 0.11 for R. sativus to 0.84 for B. alba with the average value of 0.43, in which Mn and As are the major con- tributions to the total THQ with the average values of 75% and 18%, respectively. The safety assessment based on national regulations and THQ indicated that the consumption of investigated vegetables poses no risk to the consumers.
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Analysis of the 16C(d,p)17C reaction from microscopic 17C wave functions
Le Hoang Chien and P. Descouvemont
Physical Review C (2023) 108, 044605
Abstract:
| We present a semimicroscopic study of the 16C(d,p)17C transfer reaction. The 17C overlap integrals and spectroscopic factors are obtained from a microscopic cluster model, involving many 16C+n configurations. This microscopic model provides a fair description of the 17C bound-state energies. The 16C+d scattering wave functions are defined in the continuum discretized coupled channel (CDCC) method, where the deuteron breakup is simulated by pseudostates. The transfer cross sections are in good agreement with recent data. We confirm the 16C(2+)+n structure of the ground state, and show that deuteron breakup effects have a significant influence on the cross sections. We study the 17C(p,d)16C reverse reaction and suggest that the cross section to the 2+ state should be large. A measurement of the ground-state cross section would provide a strong test of the microscopic wave functions. |
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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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