FACULTY OF PHYSICS & ENGINEERING PHYSICS

DEPARTMENT OF NUCLEAR PHYSICS - NUCLEAR ENGINEERING - MEDICAL PHYSICS

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

More detail >>

 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.

More detail >>

 

 

 

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.

More detail >>

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.

More details >>

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.

More detail >>

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

More detail >>

More Articles ...

FaLang translation system by Faboba

Links

 


   logo Truong KHTN 2021  physics          TTHN          VAEA     varans1          nri logo           canti1