BẢN TIN KHOA HỌC

Phan Long Ho, Le Dinh Hung,Vu Tuan Minh,Dang Van Chinh, Tran Thien Thanh, Chau Van Tao

Science of The Total Environment, Available online 18 June 2020, 140291

Abstract:

This paper presents information on the concentration of radioactivity and chemicals at 12 water stations that used groundwater as their raw water supply source. The groundwater's radioactivity was higher than the treated, tap, and surface water, but lower than the national and international recommendations. At five stations (41.7%), the gross alpha contents were higher than the levels advised by Vietnam's regulations, but met the WHO and IAEA's recommendations. The mean active (Bq L⁻¹) gross alpha, gross beta, Ra-224, Ra-226, and Ra-228 were 0.093 ± 0.012, 0.221 ± 0.020, 0.031 ± 0.004, 0.028 ± 0.004, and 0.035 ± 0.001, respectively. The contribution of Ra-226 to the gross alpha was in a range of 23%–60% (r = 0.91, p value <.001), and the ratio of Ra-226/Ra-228 ranged from 0.49–1.06. For the treated and tap water, each age groups' annual committed effective dose was lower than the international regulations. The concentration of the total dissolved solids, sulfate, chloride, sodium, barium, and manganese met the national regulations. However, during the rainy season, the surface water in the area was affected by saltwater intrusion, with salinity up to 4.1‰. Discriminant analysis was applied to study the differences among the water groups. As a result, the treated and tap water were separated from the others.

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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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Phuong Truc Huynh, Trinh Pham Ngoc Tran, Binh Thanh Dinh, Linh Thi Truc Nguyen, Loan Thi Hong Truong, Anh Tuan Tran, Dung Manh Ho, Dong Van Nguyen

Journal of Radioanalytical and Nuclear Chemistry (2020) 324:663–671

Abstract:

The aim of this study was to nd trace elements that increase risk of breast cancer based on the deviation of the concentra- tion of trace elements in the ngernail collected from the women with breast cancer and the normal women. The study was conducted with 10 elements (As, Au, Br, Co, Cr, Fe, Sb, Sc, Se, and Zn) using k0-INAA and statistical analysis method. Signi cant di erences (P < 0.05) were found for Cr, Fe, Sc and Zn between the case and the control groups. A signi cant correlation between Fe and Zn has found for the normal women, but this disappears in the women with breast cancer. On the contrary, a signi cant correlation between As and Cr has found in the case group, but no such correlation has noticed for the control group. The elements Cr, Fe, and Zn may be associated to the risk of breast cancer.

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