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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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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