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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

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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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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Yu Nakazawa, Tai Thanh Chau, Yuki Fuji, Masahiro Ikeno, Satoshi Mihara, Masayoshi Shoji, Tomohisa Uchida, Kazuki Ueno,  Myeong Jae Lee

Proceedings of Science, European Physical Society Conference on High Energy Physics - EPS-HEP2019 - 10-17 July, 2019

Abstract:

The COMET Phase-I experiment searches for a neutrinoless muon-to-electron conversion which has never been observed yet. The world’s highest intensity muon beam is applied, and it leads to an unacceptable trigger rate of O (106 ) Hz. For stable data collection, the trigger rate must be reduced to O(103)Hz. This requirement is met using online event classification in the detector system which holds 99% of signal events. This classification is performed by an FPGA-based trigger system, and its processing time is set to less than 5μs by a buffer size of the detector readout electronics. A prototype board for the trigger system was developed, and communica- tion systems for related electronics devices were also constructed. From test results, the total processing time is estimated to be 2.8 μ s , which meets the requirement. We have also devel- oped an online self-trigger system for cosmic-rays and confirmed the feasibility of this hardware logic. The trigger electronics were installed in a setup for cosmic-ray measurement, and the data acquisition was successfully done using the self-trigger system.

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Bui Ngoc Thien, Vu Ngoc Ba, Nguyen Thi Thao Vy, Truong Thi Hong Loan

Chemosphere Volume 259, November 2020, 127432

Abstract:

In this study, soil-to-plant transfer factor and annual organ equivalent dose due to ingestion of natural radionuclides in 13 popular food crop samples in Ho Chi Minh city, Vietnam were estimated. The obtained data show that the radioactive elements transported from soil to plants play an essential role as indicators for the nutritional needs of plant and the ability to accumulate radioisotopes and heavy metal elements for environmental decontamination. It is found that B. alba and C. gigantean is useful for decontamination of high content potassium in soil, otherwise, P. fruticosa and C. gigantean may be used for soil with high concentration of 210Pb and 226Ra. In addition, biological effects of the plant ingestion in human body were assessed. The doses due to ingestion of food crop samples varied from organ to organ, depending on the organotrophic properties of the radionuclides. For examples, equivalent dose for 40K in large intestine is higher than other organs. In contrast, equivalent dose for 238U, 226Ra, 210Pb and 232Th were mostly at bone surface. In general, the obtained dose values of lower than the average value recommended by UNSCEAR for food crop ingestion pose no threat to the public’s health. However, close investigations are needed in the near future.

 
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