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TRƯỜNG ĐẠI HỌC KHOA HỌC TỰ NHIÊN, ĐẠI HỌC QUỐC GIA THÀNH PHỐ HỒ CHÍ MINH

KHOA VẬT LÝ - VẬT LÝ KỸ THUẬT

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

Van Thang Nguyen, Nguyen Phong Thu Huynh, Cong Hao Le

Environmental Science and Pollution Research (2020)

 

Abstract:

Groundwater is a major source of drinking water and agricultural water in some regions of the world. However, it contains a high level of 226Ra that is potentially hazardous to human health and the environment. Normally, the activity concentration of 226Ra in groundwater is determined to assess the quality of groundwater that can be used as drinking water. There are few studies on the accumulation of 226Ra in the agricultural soil due to irrigation with groundwater. In this study, levels of 226Ra were determined on over 60 groundwater samples collected from the public water supply wells in Phu Yen province, Vietnam. Besides assessment of the health risks to population due to drinking groundwater samples, the impact of groundwater irrigation to the maize field in the study area was studied. For this purpose, two chemical fate models were applied and the comparison of their results was performed. Based on the model assessments, we predicted that the present agricultural practices increased the 226Ra activity concentration in the maize soil, and the level of 226Ra activity concentration in the topsoil can exceed the recommended level at 11.4 years of the present agricultural practices on the maize soil.

 

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Trần Nhân Giang, Nguyễn Tấn Được, Nguyễn Thị Mỹ Lệ, Bùi Hoàng Minh

Tạp chí Khoa học Trường Đại học Cần Thơ Tập 56, Số chuyên đề: Khoa học tự nhiên (2020)(1):90-97

Tóm tắt:

Nghiên cứu này được thực hiện nhằm khảo sát khả năng phục hồi ảnh của thuật toán tích chập trong phương pháp chụp ảnh nhiễu xạ sử dụng tia X kết hợp không hoàn toàn. Nghiên cứu được thực hiện bằng việc sử dụng chùm tia X tới với các mức độ kết hợp khác nhau và các loại mẫu khác nhau nhằm khảo sát khả năng phục hồi ảnh của thuật toán tích chập ở những điều kiện khác nhau. Kết quả đạt được trong nghiên cứu này cho phép đánh giákhả năng áp dụng của thuật toán tích chập trong phương pháp chụp ảnh nhiễu xạ sử dụng tia X kết hợp không hoàn toàn.

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Investigation of the ground-state spin inversion in the neutron-rich 47,49 Cl isotopes

B. D. Linh, N.T.T.Phuc et al.
Phys. Rev. C 104, 044331

Abstract:

A first γ-ray study of 47,49Cl spectroscopy was performed at the Radioactive Isotope Beam Factory with 50Ar projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen target of the MINOS device. Prompt deexcitation γ rays were measured with the NaI(Tl) array DALI2+. Through the one-proton knockout reaction 50Ar(p,2p), a spin assignment could be determined for the low-lying states of 49Cl from the momentum distribution obtained with the SAMURAI spectrometer. A spin-parity Jπ=3/2+ is deduced for the ground state of 49Cl, similar to the recently studied N=32 isotope 51K. The evolution of the energy difference E(1/21+)E(3/21+) is compared to state-of-the-art theoretical predictions.

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Investigation of the effects of chemotherapy on trace element contents in the nails in patients with colorectal cancer

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

Journal of Radioanalytical and Nuclear Chemistry (2021) 328:1173–1180

Abstract:

The aim of this study was to evaluate the effects of cancer treatment with chemotherapy for the trace elements in nails of patients with colorectal cancer. The contents of trace elements in the nails of 102 patients with colorectal cancer (including treated and untreated) and 60 healthy subjects were analyzed using k0-standardization method of neutron activation analysis. All participants aged between 32 and 76. Result of this study showed that the contents of nine trace elements (As, Br, Co, Cr, Hg, Fe, Sc, Se, and Zn) in the nails were measured. Furthermore, this study showed that there was significant difference in the contents of the elements Fe, Se, and Zn in both colon and rectal cancer patient groups between untreated and treated subjects with chemotherapy. We conclude that the contents of Fe, Se, and Zn in the nail samples may be used to evaluate of the colorectal cancer risk, and they may be affected by chemotherapy.

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Truong Thi Hong Loan, Vu Ngoc Ba, Dang Thi Thuy Dan, Vuong Minh Tri, Huynh Thi Yen Hong, Truong Huu Ngan Thy, Nguyen Thi Truc Linh, Le Cong Hao & Huynh Truc Phuong 

Journal of Radioanalytical and Nuclear Chemistry 327, 609-616(2021)

Abstract:

In this work, the impacts of TENORM (Technologically Enhanced Naturally Occurring Radioactive Materials) from fertilizers on soil and vegetables were estimated. We investigated both the activity concentration of the natural radionuclides and the annual effective dose rate due to the ingestion of vegetables in the crops using fertilizers at the agricultural zone of Hoc Mon, Ho Chi Minh City, Vietnam. The results show that there have not yet been signs of radioactive residues from using conventional fertilizers in agricultural land after a crop at the surveyed area and time. The radiological impact of surveyed vegetables was negligible to the public health.

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Nguyen Le Anh , Nguyen Hoang Phuc , Dao T. Khoa , Le Hoang Chien , Nguyen Tri Toan Phuc

Nuclear Physics A 1006 (2021) 122078

Abstract:

The proton radiative capture 12,13C(p, γ ) reactions at astrophysical energies, key processes in the CNO cycle, are revisited in the potential model with the proton-nucleus potential for both the scattering and bound states obtained in the folding model, using a realistic density dependent nucleon-nucleon interaction. For the consistency, this same folding model is also used to calculate the optical potential of the elastic p+12,13C scattering at energies around the Coulomb barrier. The folded p+12,13C optical potentials are shown to account well for both the elastic p+12,13C scattering and astrophysical S factors of the radiative capture 12,13C(p, γ ) reactions.

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