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KHOA VẬT LÝ - VẬT LÝ KỸ THUẬT

BỘ MÔN VẬT LÝ HẠT NHÂN - NGÀNH KỸ THUẬT HẠT NHÂN - NGÀNH VẬT LÝ Y KHOA

Nguyen Huu Quyet, Le Hong Khiem, Trinh Thi Thu My, Nguyen Thi Bao My, Marina Frontasieva, Inga Zinicovscaia, Nguyen An Son, Tran Thien Thanh, Le Dai Nam, Khuat Thi Hong, Nguyen Ngoc Mai, Trinh Dinh Trung, Duong Van Thang, Nguyen Thi Thuy Hang

Environmental Engineering and Management Journal

Abstract:

Atmospheric deposition of chemical elements in the Hanoi region has been investigated in this study based on moss biomonitoring. Twenty-seven Barbula indica moss samples were collected from the end of 2016 to the beginning of 2017, and the concentrations of 33 chemical elements in the samples were determined by instrumental neutron activation analysis. The results show that Hanoi’s air is highly polluted with Zn, Ba and Ta, and slightly polluted with Al, Cl, Sc, Ti, V, Cr, Mn, Fe, Ni, Co, As, Cd, Sb, La, Ce, Sm, Gd, Tb, Yb, Hf, Th and U. A determination of the possible pollution sources has been made for the analyzed elements; namely: coal and oil combustion are the main sources of V, Ni, Co and As; vehicle exhaust and non-exhaust sources, as well as industrial emissions, are the main sources of Mn, Co, Cd and Ba; construction dust is the source of Ca, Mg and Sb; various industries are the sources of Cr and Ni; the dust from cement kilns and ash from biomass burning is responsible for K and Cl; two-stroke motor vehicles, galvanizing factories and tire wear are the sources of Zn; and Br may be emitted from burning wastes.

 

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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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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

 

 

 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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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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