Phan Long Ho, Le Dinh Hung,Vu Tuan Minh,Dang Van Chinh, Tran Thien Thanh, Chau Van Tao
Assessment of physicochemical properties and radioactivity in groundwater at households living in bac Lieu province, vietnam
Phan Long Ho, Le Dinh Hung, Vu Tuan Minh, Nguyen Tran Bao Thanh, Dang Van Chinh, Le Hoang Minh, Tran Thien Thanh, Chau Van Tao
Environ Geochem Health
Abstract:
This paper presents findings on groundwater physiochemical composition and radioactivity levels in households in Bac Lieu province, Vietnam. Through discriminant analysis, it was observed that groundwater quality exhibits spatial variations corresponding to saline intrusion zones. The paired-samples T-tests revealed significantly different ratios of Ra-224, Ra-226, and Ra-228 isotopes between Na–Cl and Ca–Na–HCO3 water types. All three water types had a ratio of Ra-226/Ra-228 of approximately one, indicating the presence of groundwater aquifers beneath the crust and fluvial marine sediment. Furthermore, strong associations between sulfate and calcium suggest that CO2 enrichment in groundwater aquifers indicates anoxic aquatic environments. Twenty-five of the thirty-three evaluated samples exceeded the national technical regulations for domestic water quality with parameters such as chloride, sulfate, sodium, gross alpha, or total dissolved solids. Fifteen samples exceeded gross alpha's allowable contamination threshold of 0.1 Bq/L. The combination of Ra-226 and Ra-228 did not surpass the U.S. Environmental Protection Agency's recommended limit of 0.185 Bq/L. However, nineteen samples exhibited annual committed effective doses of radium isotopes for infants that exceeded the WHO recommendation of 0.1 mSv/year.
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L. H. Khiem, K. Sera, T. Hosokawa,N. H. Quyet, M. V. Frontasyeva, T. T. M. Trinh, N. T. B. My, N. T. Nghia, T. D. Trung, L. D. Nam, K. T. Hong, N. N. Mai, D. V. Thang, N. A. Son, T. T. Thanh, D. P. T. Tien
Journal of Radioanalytical and Nuclear Chemistry, published online: 21 February 2020
Abstract:
The concentration of 22 metal elements including Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, As, Br, Rb, Sr, Zr, Ba and Pb in Barbula Indica moss samples collected in 12 di erent sites in Ha Noi in July of 2018 were determined by Proton Induced X-ray Emission. The obtained results has been used for assessment of heavy metal pollution in the air in Ha Noi region. The factor analysis was applied to the concentration data of 11 interested elements and the possible sources of air pollution have been suggested. The study showed that the PIXE technique is e cient to environmental pollution analysis since it precise, fast and low-cost.
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Assessment of annual effective dose from radium isotopes in groundwater samples in households along the lower Mekong River
Phan Long Ho, Vu Tuan Minh, Le Dinh Hung, Do Quoc Trung, Dang Van Chinh, Tran Thien Thanh, Chau Van Tao
Abstract
In this study, the 224Ra, 226Ra, 228Ra in groundwater samples at Long Phu district were determined by HPGe detector with co- precipitation method. The median concentrations were 0.040 ± 0.005 Bq L−1, 0.039 ± 0.004 Bq L−1, and 0.049 ± 0.004 Bq L−1. Highest MDC values were 0.028 Bq L−1, 0.010 Bq L−1, 0.018 Bq L−1, respectively. It’s a strong relationship between 224Ra, 228Ra versus conductivity, salinity, TDS, SO42−. The annual e ective dose of the age groups was lower than the WHO rec- ommended value except for infants exceeding around 1.5 times. Besides, the 226Ra minimum recovery obtained was 90% with trueness 9.9% and relative percentage di erence 6.1%.
Keywords Radium isotopes · Groundwater · Co-precipitation method · Gamma spectrometry · Annual e ective dose · Pearson correlation
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DOI: https://doi.org/10.1007/s10967-019-06699-z
Assessing radiation hazards associated with natural radioactivity in building materials in Ho Chi Minh City, Vietnam
Vuong Le Quang, Chuong Huynh Dinh, Nhat Lam Duy , Tam Hoang Duc, Thanh Tran Thien, Minh Vu Tuan, Hung Le Dunh, Ho Phan Long , Tao Chau Van
Nuclear Technology & Radiation Protection: Year 2023, Vol. 38, No. 1, pp. 30-38
Abstract:
This study is aimed at assessing radiation hazards associated with natural radioactivity in common building materials used in Ho Chi Minh City, Vietnam. Thirty-six samples from eighteen types of building materials were collected to measure activity concentrations using the gross alpha/beta counting system and gamma-ray spectrometry. The gross alpha and gross beta activity concentrations ranged from 94.7 ± 31.3 to 1045.1 ± 112.3 Bqkg-1 and 104.9 ± 4.7 to 834.4 ± 37.1 Bqkg-1, respectively. In addition, the activity concentrations of 226Ra, 232Th, and 40K were also determined, which ranged from 4.1 ± 0.1 to 53.5 ± 0.4 Bqkg-1, 5.7 ± 0.1 to 83.6 ± 0.8 Bqkg-1, and 14.9 ± 0.8 to 664.9 ± 10.6 Bqkg-1, respectively. The indices including radium equivalent activity, external and internal radiation hazard, gamma and alpha indices, activity utilization index, and annual effective dose, were calculated to evaluate the radiological hazards of natural radioactivity. The results showed that these indices were below the recommended safety limits for most investigated samples except six brick samples, whose activity utilization indexes are slightly higher than the safety limit. Even so, all annual effective doses of the samples were found to be below the world average.
Keywords: building material, gross alpha/beta, gamma spectrometry, natural radioactivity, radiological hazard
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Application of the Calculable R-matrix to Study the 12, 13C(p,γ)13, 14N Reaction
Nguyen Hoang Phuc, Nguyen Tri Toan Phuc, Do Cong Cuong
Few-Body Systems (2026) 67:15
Abstract
We apply the calculable R-matrix method to determine the cross sections of the 12, 13C(p, γ)13, 14N reactions using both local Woods-Saxon (WS) and nonlocal Perey-Buck (PB) potentials. Benchmark calculations are first performed for the 12C(p, γ)13N reaction, and the results show good agreement with the standard codes FRESCO and RADCAP, as well as with recent calculations in other works. Furthermore, the method is applied to investigate the 13C(p, γ)14N reaction. Analysis of the astrophysical S-factors for both reactions indicates no significant difference between the local and nonlocal potential calculations, with discrepancies limited to approximately 7%–8%. The successful application of the calculable R-matrix method to these (p, γ) processes provides a framework for future studies involving nonlocal potentials derived from microscopic models.
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