Huynh Dinh Chuong, Nguyen Thi Hai Yen, Nguyen Thi My Le, Hoang Duc Tam
Applied Radiation and Isotopes Available online 29 April 2020, 109197
Abstract:
This study proposes an approach to determine the density of a liquid based on the gamma scattering method. The liquids used to determine density were poured in a cylindrical tube. This approach requires that the ratio R (the ratio of area under a single scattering peak for a liquid to that for water) increase linearly with an increase in the density of the liquid. In a certain range of density, a linear relationship was obtained between the ratio R and density, as described by a linear calibration curve with coefficients of slope and intercept, for the investigated tube diameters. In particular, the values of the slope and intercept could be expressed as mathematical functions of the diameter of the tube. For a given tube, the coefficients of slope and intercept of the linear calibration curve were obtained based on these functions, which helped determine the density of the liquid. The reliability of the proposed approach was evaluated by using it to calculate the densities of five liquids—n-hexane, diethyl ether, acetonitrile, toluene, and glycerol—using tubes with inner diameters of 1.8 cm, 2.25 cm, and 2.68 cm. The results show that the maximum relative deviation between the reference and the measured densities was 4.3%.
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Determining the appropriate ratio of fly ash as cement replacement in concrete and evaluating the radiation dose of the fly ash concrete
Lam Duy Nhat, Vu Tuan Minh, Ho Van Doanh, Le Huu Loi, Le Quang Vuong, Phan Long Ho, Tran Thien Thanh, Hoang Duc Tam
Journal of Radioanalytical and Nuclear Chemistry
Abstract:
This study uses fly ash (FA) as a cement replacement in concrete and evaluates the radiological safety of this concrete sample. Different fly ash mixing ratios were investigated and found that with a mixing ratio of 35%, the compressive strength of FA concrete is the highest (from 38 to 48 MPa). Next, we evaluate the radiation safety of the FA concrete by analyzing the isotopes 226Ra, 232Th, and 40K using two low background gamma spectrometers. The obtained results showed that the use of FA in concrete production is entirely feasible as it meets both construction and radiation safety-related requirements.
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Huynh Truc Phuong, Tran Pham Ngoc Trinh, Dinh Thanh Binh, Nguyen Thi Truc Linh, Truong Thi Hong Loan, Tran Tuan Anh, Ho Manh Dung, Nguyen Van Dong
Science & Technology Development Journal, 22(4):370-377
Abstract:
Introduction: Breast cancer is the most common type of cancer resulting in death. Trace elements of Fe, Se and Zn can play a key role in the onset and prevention of breast cancer. Trace elements in the fingernails may be used as bioindicators for breast cancer diagnosis. The purpose of this work is to determine the concentrations of Fe, Se, and Zn in the fingernails of women with breast cancer and healthy women, which used to find the difference and correlation of these elements in the fingernail.
Methods: This research was approved by the Ethics Committee of Dong Nai General Hospital. The fingernail collected from 29 women with breast cancer and 30 healthy women, who are the same age and living in Dong Nai province, Vietnam. The concentrations of Fe, Se, and Zn in the fingernails were determined using the k0-INAA method. The analytical data were evaluated using some statistical analysis for the correlation of trace elements in the fingernails of both groups.
Results: As a result, the mean concentrations of Fe, Se and Zn in fingernails of women with breast cancer were 102.87 ug/g, 0.75 ug/g and 65.49 ug/g, respectively, while those of healthy women were 69.74 ug/g, 0.78 ug/g and 107.75 ug/g. The assessment of these elements in fingernails for both two sample groups, including t-test and correlation coefficients, was also carried out in this study. As a result, the significant difference (p < 0.05) was found for the Fe and Zn in fingernails of women with breast cancer, while those of Se was not found. The correlation between Se and Zn was found in both groups. The correlation between Fe and Zn was found in fingernails of healthy women, but it disappears in the women with breast cancer.
Conclusions: From our finding, it can be concluded that Fe and Zn significantly associated with the risk of breast cancer, while Se is not associated.
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Determination of some elements in the nails in patients with colon cancer using total reflection X-ray fluorescence
Huynh Truc Phuong, Nguyen An Son, Nguyen Thi Nguyet Ha, Nguyen Thi Minh Sang, Nguyen Thi Truc Linh, Dinh Thanh Binh, Truong Thi Hong Loan, Ho Manh Dung, Tran Tuan Anh, Nguyen Van Dong
Spectrochimica Acta Part B: Atomic Spectroscopy 182 (2021) 106234
Abstract:
Sixty-two subjects (31 men with colon cancer) participated in this study. The analysis of elements in the nails was performed by total reflection X-ray fluorescence (TXRF) technique. The results showed that fifteen elements were quantifed, including the following: S, P, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, and Br. We have found that there were significant differences in the concentrations of elements Ca, Cr, Fe, Cu, Zn, As, and Se between normal subjects and men with colon cancer (p < 0.05). We conclude that TXRF is a technique suitable for elemental analysis in human nail samples. The concentration of elements Ca, Cr, Fe, Cu, Zn, As, and Se could be among the factors used for the diagnosis of colon cancer risk in men.
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DEPTH-DOSE DISTRIBUTION DEPENDENCE ON THE ENERGY PROFILE OF LINEAR AND LASER WAKEFIELD ACCELERATOR ELECTRON BEAMS
N.A.Tuan, C.V.Tao, R.Chary
12th Int. Particle Acc. Conf.
Abstract:
The depth-dose distributions of 10 MeV electron beams used for food irradiation and sterilization purposes at Research and Development Center for Radiation Technology, HCMC, Vietnam are measured and the results are well re-produced by the MCNP simulations. We extend the simulations to predict the dose depth distribution for 10 MeV electron beams with the energy profiles of a model Laser Wake Field accelerator (LWFA). The dosimetry and simulation results show that the maximum dose of the depth-dose curve inside the product are 1.4 times surface dose with an area density limit of 8.6 g/cm2 for two-sided irradiation with nearly mono-energetic beams from linear accelerator and the corresponding parameters for LWFA are 1.2 times surface dose and 13.0 g/cm2, respectively.
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Deconvolution approach for determining absolute prompt 𝛾-ray intensities of 52V yielded from the 51V(n, 𝛾)52V reaction at the Dalat Nuclear Research Reactor
Thanh Tai Chau, Ngoc Son Pham, Thien Thanh Tran, Van Tao Chau
Annals of Nuclear Energy 222 (2025) 111587
Abstract:
All previous research relied on equipment such as Compton suppression spectrometers or coincidence spectrometers to determine the absolute prompt 𝛾-ray intensities of 52V obtained from 51V(n, 𝛾) reaction. In the present work, we utilize a deconvolution method to determine the absolute prompt 𝛾-ray intensities of the 52V measured by the HPGe detector of the PGNA spectrometer at horizontal channel No. 2 of the Dalat Nuclear Research Reactor (DNRR). This new method is based on the validated Geant4 simulation to deconvolute the prompt 𝛾-ray spectrum of 52V and an in-beam saturated neutron capture reaction in a vanadium foil as the research sample and self-internal standard. Subsequently, by counting the 1.434 MeV delayed 𝛾-ray peak emitted by 52V, the absolute prompt 𝛾-ray intensities can be obtained. These 𝛾-ray intensities were then compared to those in the ENSDF database and other references, which show a good agreement.
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