APPLICATON OF NUCLEAR PHYSICS - NUCLEAR ENGINEERING
IN MEDICAL BIOLOGY
The Medical Physics Group studies the application of physics concepts, theories and methods to medicine or healthcare, especially the application of nuclear technology in diagnosis and treatment of cancer disease.
In average, 15 - 20 students enroll in the Medical Physics program each year. Besides basic knowledge of Physics and Nuclear Physics, students are equipped with specialized subjects such as human body and physiology, radiation biology, radiation physics fundamental, physics fundamental in radiotherapy, physics fundamental in imaging diagnosis, medical image processing, physics fundamental in medical physics, etc. Students are also sent to large hospitals such as Cho Ray Hospital, Oncology Hospital HCMC, 175 Military Hospital, 115 Hospital etc. for clinical practice and doing research.
The major research interests of the Medical Physics Group include three main areas: radiation safety, radiotherapy, and medical image processing.
I. RESEARCH TOPICS
1.1 Radiation safety: Until now we have focused our research on radiation safety for some medical diagnostic devices such as routine radiographs, CT, ... using Monte Carlo simulation techniques. From simulation models, we study dose rate distribution around diagnostic devices in working modes, estimate the impact of secondary scattering rays, assess radiation safety for shielding, assess the absorbed dose in patients...
Figure 1. 2D dose distribution surrounding conventional radiograph at the spine X-ray mode.
Figure 2. 2D dose distribution surrounding conventional radiograph at the chest X ray mode.
1.2 Radiotherapy:
Proton therapy: Up to now, in the world, the margin concept for both the PTV (ICRU, 1994) and the PRV (ICRU, 1999) are used to account for geometrical uncertainties in treatment planning. This method is valid only when PTV DVH and PRV DVHs are representative of CTV DVH and OAR DVHs each. In proton therapy, the average margin as in used the PTV concept and the PRV concept have limits due to the geometrical errors in the direction perpendicular to the beam are more significant than in the direction parallel with the beam, especially in intensity modulated proton therapy (Lomax, 1999; Lomax, 2008b). There have been some authors optimized the treatment plan was not using CTV-PTV margin and OAR-PRV margin. However, these methods result in the plans not having not high appearance probability in treatment because of assumption of ideal worst dose distribution such as worst plan (Pflugfelder et al., 2008) or not investigating the moving organ errors (Albin Fredriksson et al., 2011). In this work, we used DVPH concept (T B Nguyen et al., 2009) to evaluate proton therapy treatment plan. This method simulates directly the errors in the treatment process to evaluate CTV DVHs with desired confidence level. We used CERR program and LAP program ( Joseph O. Deasy et al., 2003) written by the School of Medicine of University of Washington in St. Louis to simulate CTV DVHs and OAR DVHs of prostate tumor. The results show the DVH CTVs in a meaningful way and the PTV and PRV concept are no longer valid in proton therapy. DVPH tool is the best method for evaluating the treatment plan in proton therapy and overcome the limits of traditional method using margin concept. However, calculating DVPH by recalculation method is very time-consuming. To reduce the computational time, we will find out the algorithm to calculate the dose distribution which approximates the real dose distribution as close as possible. With the reasonable calculating DVPH time, we will optimize the intensity modulated proton therapy plan with high reliability.
The results showed that the PTV concept for ensuring the prescribed dose actually delivered to the CTV is invalid in proton therapy. Even a good PTV DVH might result in an underdose to the target. For OARs, the conventional evaluation might underestimate the dose for same area and overestimate the dose for another area. The concept DVPH applied for proton therapy has been proved to provide a more accurate CTV and OAR DVH evaluation in proton therapy.
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Figure 3. 2197 CTV DVHs with geometrical uncertainties. |
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Figure 5. CTV DVPH. |
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Figure 7. PTV DVH and DVPH with 90% confidence level. |
Figure 8. Static Rectum DVH and DVPH with 90% confidence level. |
Jaw-only intensity modulated radiation therapy: In this study, we calculate and analysis the beam profiles and dose distribution of Intensity modulated radiation therapy for the linear accelerators using standard collimator jaws (JO-IMRT). The results are compared with the Prowess Panther planning system for head and neck cancer cases. Besides, we also study the distribution of edge scattering effects on the dose distribution.
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Figure 9. Siemens Primus Linear Accelerator. |
Figure 10. Jaw-Only Collimator |
1.3 Medical image processing:
Automated segmentation and registration 4DCT lung images: Registration and segmentation 4D-CT lung images: 4D-CT lung cancer treatment planning strategies requires highly accurate anatomical segmentation of tumor volumes to reduce the geometric uncertainty from respiratory motion. In this work, we study methods for automatically creating contours surround each lung and finding the geometrical relationships between respiratory phases on the 4D-CT dataset.
II. SELECTED PUBLICATIONS
1. Truong Thi Hong Loan, Tran Ai Khanh, Vo Thi Thuy Dung, Dang Nguyen Phuong, Le Thanh Xuan, Nguyen Thi Cam Thu, Nguyen Thi Truc Linh, “Study on dose rate distribution surrounding to diagnostic X ray facilities and estimate the influence of scattering effect from the shielding by MCNP5 code”, The annual meetings of Japan Radiology Society and Japan Society of Radiological Technology from April 11 to 14, 2013, JSMP, in Yokohama, Japan.
2. Trần Ái Khanh, Võ thị Thùy Dung, Trương Thị Hồng Loan, Mai Văn Nhơn, Đặng Nguyên Phương, “Mô phỏng phổ tia X và các ảnh hưởng lên phổ bằng chương trình MCNP5”, Báo cáo Hội nghị Khoa học lần thứ 8, Trường Đại học Khoa học Tự nhiên, Đại học Quốc Gia TP. Hồ Chí Minh, 2012.
3. Trương Thị Hồng Loan, Nguyễn Thị Trúc Linh, Trần Ái Khanh, Nguyễn Thị Cẩm Thu, Lê Thanh Xuân, Thái Mỹ Phê, Lỗ Thái Sơn, Ngô Thị Ánh Quy, Tăng Hồng Phước, “Tính toán an toàn che chắn cho phòng X quang chẩn đoán quy ước”, Hội nghị Khoa học và Công nghệ Hạt nhân toàn quốc lần thứ 10, tại Vũng Tàu (15-16/8/2013).
4. Trương Thị Hồng Loan, Lê Thanh Xuân, Nguyễn Thị Cẩm Thu, Trần Ái Khanh, Nguyễn Thị Trúc Linh,Thái Mỹ Phê, Lỗ Thái Sơn, “Đánh giá phân bố suất liều mặt của chùm tia X từ thiết bị X quang nha khoa bằng chương trình MCNP5”, Hội nghị Khoa học Thường niên Bệnh viện Chợ Rẫy tháng 4/2014.
5. Trần Ái Khanh, Trương Thị Hồng Loan, Mai Văn Nhơn, Đặng Nguyên Phương, “Nghiên cứu các thông số ảnh hưởng lên phổ tia X sử dụng phương pháp Monte Carlo”, Hội nghị Khoa học Thường niên Bệnh viện Chợ Rẫy tháng 4/2014.
6. Truong Thi Hong Loan, Le Thanh Xuan, Tran Ai Khanh, Nguyen Thi Cam Thu,Thai My Phe, Lo Thai Son, Nguyen Thi Truc Linh, “Study on distribution of surface dose rates from X ray tube and evaluation for radiation safety of shieldings at conventional diagnostic radiology room using MNCN5 code”, 14th Asia-Oceania Congress of Medical Physics & 12th South East Asia Congress of Medical Physics (AOCMP/SEACOMP 2014), 23‐25 October 2014, at Hotel Novotel Saigon Centre, Ho Chi Minh City, Vietnam.
7. Tran Ai Khanh, Truong Thi Hong Loan, Dang Nguyen Phuong, Le Thanh Xuan, Nguyen Thi Cam Thu, Thai My Phe, Lo Thai Son, Nguyen Thi Truc Linh, “Survey to radiation doses of X ray room in HCM city”, 14th Asia-Oceania Congress of Medical Physics & 12th South East Asia Congress of Medical Physics (AOCMP/SEACOMP 2014), 23-25 October 2014, at Hotel Novotel Saigon Centre, Ho Chi Minh City, Vietnam.
8. Trần Ái Khanh, Đặng Nguyên Phương, Trương Thị Hồng Loan, Mai Văn Nhơn, “Sử dụng tính toán song song trong MCNP5 trong mô phỏng phân bố liều tia X”, Kỹ yếu Hội nghị khoa học Trường Đại học Khoa học Tự nhiên lần 9, tháng 11/2014.
9. Trần Ái Khanh, Trương Thị Hồng Loan, Đặng Nguyên Phương, Nguyễn Thị Kim Xuyến, Nguyễn Anh Tuấn, Mai Văn Nhơn, “Khảo sát phổ phát tia X bằng phương pháp mô phỏng Monte Carlo và tính toán bán thực nghiệm”, Kỹ yếu Hội nghị Khoa học Trường Đại học Khoa học Tự nhiên lần 9, tháng 11/2014.
10. Dose Volume Population Histogram (DVPH): A New Method to Evaluate Intensity Modulated Proton Therapy Plans With Geometrical Uncertainties, T Nguyen, B Nguyen, N Mai, the 57 American Association of Physics in Medicine Meeting (accepted), 2015.
11. Comparison of Intensity Modulated Photon Therapy and Intensity Modulated Proton Therapy plans for Prostate Cancer, Nguyen Thi Cam Thu, Nguyen Thai Binh, Mai Van Nhon, Science & Technology Development Journal, VNU,Vietnam ( accepted), 2015
12. Lập kế hoạch xạ trị điều biến cường độ chùm proton bằng hệ thống lập kế hoạch CERR, Nguyễn Thị Cẩm Thu, Nguyễn Thái Bình, Mai Văn Nhơn, Hội nghị Khoa học và Công nghệ Hạt nhân toàn quốc lần thứ 10, 2013.
APPLICATION OF NUCLEAR PHYSICS - NUCLEAR ENGINEERING IN MATERIAL SCIENCE
I. Research interests
- Development of polymer electrolyte membranes for hydrogen type fuel cells and characterization the hierarchical structure-property relationship for high fuel cell performance using quantum beam analysis and direct observations (Small and Ultra small angle X-ray scattering (SAXS/USAXS), Wide angle X-ray scattering (WAXS), Nuclear magnetic resonance (NMR), Positron annihilation lifetime spectroscopy (PALS), Doppler broadening spectroscopy (DBS), Fourier transform infrared spectroscopy (FT-IR), Atomic force microscope (AFM), Scanning electron microscope (SEM), Polarized light microscopy, Titration analysis (TA), Thermal gravimetric analysis (TGA), Differential scanning calorimetry (DSC), Electrochemical impedance spectroscopy (EIS), Mechanical testing).
- Physics and application of low-dimensional structures using quantum beam analysis and direct observations.
- Structure - property relationship for high performance polymer.
II. Recent results
Radiation-induced graft polymerization of styrene onto an ETFE substrate and the subsequent sulfonation to prepare ETFE-PEM.
Schematic illustrations of the morphology change in the higher-order structures according to the preparation procedures of the pristine ETFE, grafted-ETFE and ETFE-PEM.
Schematic illustrations of the morphology change in the higher-order structures of the ETFE-PEMs as a function of the IEC.
(a) Small angle X-ray scattering (SAXS) profiles of the grafted-ETFE with GDs of 0−117%. (b) Scattering profiles in the low q-region (q-region II: q = 4.0 × 10−3−1.5 ×10−1 nm−1) were enlarged.
Positron annihilation lifetime spectroscopy (PALS) profiles of Grafted-ETFE (a) and ETFE-PEM (b) as a function of grafting degree.
(a) Nuclear magnetic resonance spectroscopy (NMR) and (b) X-ray diffraction (XRD) of ETFE-PEM as a function of grafting degree.
Fourier transform infrared spectroscopy (FT-IR) of ETFE-PEM as a function of grafting degree.
Higher angle X-ray scattering profiles of Grafted-ETFE and ETFE-PEM.
Atomic force microscope (AFM) and scanning electron microscope (SEM) images.
III. Publications
International publications
1. L. A. Tuyen, E. Szilágyi, E. Kótai, K. Lázár, L. Bottyán, T.Q. Dung, L.C. Cuong, D.D. Khiem, P.T. Phuc, L.L. Nguyen, P.T. Hue, N.T.N. Hue, C.V. Tao , H.D. Chuong, Structural effects induced by 2.5 MeV proton beam on zeolite 4A: Positron annihilation and X–ray diffraction study, Radiation Physics and Chemistry, 106, 355-359, 2015.
2. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Hierachical structure-property relationships in graft-type fluorinated polymer electrolyte membranes using small- and ultrasmall-angle X-ray scattering analysis, Macromolecules, 47, 2373-2383, 2014.
3. Trinh Hoa Lang, Chau Van Tao , Kieu Tien Dung, Le Hoang Chien, Positron annihilation in perfect and defective TiO2 rutile crystal with single particle wave function: Slater type orbital and modified Jastrow functions, World Journal of Nuclear Science and Technology, 4, 33-39, 2014.
4. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Yosuke Katsumura, and Yasunari Maekawa, Poly(ethylene-co -tetrafluoroethylene) (ETFE)-based graft-type polymer electrolyte membranes with different ion exchange capacitieswith various IEC: Relative humidity dependence for fuel cell applications, Journal of Membrane Science, 447, 19-25, 2013.
5. L. A. Tuyen, Z. Kajcsos, K. Lázár, T. D. Tap , D. D. Khiem, and P. T. Phuc, Positron annihilation characteristics in multi-wall carbon nanotubes with different average diameters, Journal of Physics: Conference Series 443, 012065, 2013.
6. Tran Duy Tap, S. Sawada, S. Hasegawa, K. Yoshimura, Y. Oba, M. Ohnuma, Y. Katsumura, and Y. Maekawa, Wide-q observation in small angle X-ray scattering of ETFE-based graft-type polymer electrolyte membranes, JAEA-Review 2012-046, 32, January, 2013.
7. Trinh Hoa Lang , G. F. Wang , S. K. Lai, Free energy landscapes and volumes of coexisting phases for a colloidal dispersion, The journal of chemical physics, 132, 024910, 2010.
8. A. T. Luu, Zs. Kajcso, N. D. Thanh, T. Q. Dung, M. V. Nhon, K. Lazar, K. Havancsak, G. Huhn, Z. E. Horvath, T. D. Tap , L. T. Son, and P. T. Phuc, Multi-wall carbon nanotubes investigated by positron annihilation techniques and microscopies for further production handling, Physica Status Solidi C, 6, 2578-2581, 2009.
9. M. Maekawa, Tran Duy Tap, and A. Kawasuso, Characterization of defects by the helium and hydrogen implantation using a slow positron beam, JAEA-Review 2008-055, 153, November, 2008.
International conferences, symposium, and workshops
1. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, and Yasunari Maekawa, Hierarchical structure / property relationship in graft-type fluorinated polymer electrolyte membranes using ultra small angle X-ray scattering, International symposium on frontier in material science, 2013. 11. 17-19, Vietnam National University, Hanoi, Vietnam (Oral).
2. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, and Yasunari Maekawa, Hierarchical structure / property relationship in graft-type fluorinated polymer electrolyte membranes using small angle X-ray scattering analysis, The Internal Tokai Symposium, 2013. 07. 23-25, JAEA, Tokai, Japan (Poster).
3. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Study on the structure - property relationship of graft-type fluorinated polymer electrolyte membranes using quantum beams, Workshop on Radiation Isotope 50th, 2013. 07. 03-05, The University of Tokyo, Japan (Oral).
4. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Analysis of structure-property relationship of fluorinated graft-type polymer electrolyte membranes using quantum beams, The Yayoi meeting on radiation graft-polymerization and radiation-ionking, 2013. 03. 05, The University of Tokyo, Japan (Oral).
5. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Analysis of Small Angle X-ray Scattering Profiles of Poly(ethylene-co-tetraflouroethylene)-Based Graft-Type Polymer Electrolyte Membrane, 15th International Small-Angle Scattering Conference 2012, 2012. 11. 18-23, Sydney Convention and Exhibition Center, Australia (Poster).
6. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Hierarchical Structure Analysis of Poly(ethylene-co-tetraflouroethylene)-Based Graft-Type Polymer Electrolyte Membranes by Small Angle X-ray Scattering, 15th International Small-Angle Scattering Conference 2012, 2012. 11. 18-23, Sydney Convention and Exhibition Center, Australia (Oral).
7. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Yosuke Katsumura, Yasunari Maekawa, Relative humidity independence of properties of ETFE-based graft- type polymer electrolyte membranes for fuel cell applications, The 7th Takasaki Advanced Radiation Research Symposium (JAEA), 2012. 10. 11-12, Takasaki City Hall, Japan (Poster).
8. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Yosuke Katsumura, Yasunari Maekawa, Fluorinated polymer-based graft-type polymer electrolyte membrane: Relative humidity dependence of properties for fuel cell applications, Radiation chemistry 55th, 2012. 09. 26-28, Sendai, Japan (Poster).
9. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Small Angle X-ray Scattering Studies of Hierarchical Structure in ETFE-Based Graft-Type Polymer Electrolyte Membranes, International Union of Material Research Societies – International Conference on Electric Materials 2012, 2012. 09. 23-28, Pacifico Yokohama, Japan (Oral).
10. L. A. Tuyen, Zs. Kajcsos, K. Lázár, T. D. Tap , D. D. Khiem, P. T. Phuc, Positron annihilation characteristics in multi-wall carbon nanotubes with different average diameters, 16th International Conference on Positron Annihilation (ICPA-16), 2012. 08. 19-24, Bristol, United Kingdom, (Oral).
11. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Structure-property relationship of graft-type polymer electrolyte membranes based on partially fluorinated polymers, Radioisotopes and Radiation Research, 2012. 07. 09-11, The University of Tokyo, Japan (Oral).
12. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Analysis of the structure / property of graft-type polymer electrolyte membranes based on partially fluorinated polymers, Radiation Process Symposium, 2012. 06. 28-29, The University of Tokyo, Japan (Poster).
13. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Hierarchical structure / property analysis of ETFE-based graft-type polymer electrolyte membranes, Annual Meeting of the Chemical Society of Japan, 2012. 03. 25-28, Keio University, Japan (Oral).
14. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Kimio Yoshimura, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Analysis of the hierarchical structure - property relationship of ETFE-based graft-type polymer electrolyte membranes, 2nd International Workshop on Radiation Effects in Nuclear Technology, 2012. 02. 28-29, The University of Tokyo, Japan (Poster).
15. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Hierarchical structure analysis of ETFE-based graft-type polymer electrolyte membrane by small angle X-ray scattering, The 6th Takasaki Advanced Radiation Research Symposium (JAEA), 2011. 10. 13-14, Takasaki City Hall, Japan (Poster).
16. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Yojiro Oba, Masato Ohnuma, Yosuke Katsumura, Yasunari Maekawa, Analysis of hierarchical structure of ETFE-based graft-type polymer electrolyte membranes by small angle X-ray scattering, (Japanese Society of Radiation Chemistry), 2011. 09. 28-30, Osaka University, Japan (Oral).
17. Tran Duy Tap, Shin-ichi Sawada, Shin Hasegawa, Anada Putra, Daisuke Yamaguchi, Yojiro Oba, Satoshi Koizumi, Masato Ohnuma, Yasunari Maekawa, Yosuke Katsumura, Structural analysis of ETFE-based graft-type polymer electrolyte membranes by small angle X-ray/neutron scattering method, 2011. 08. 30-31, Tokyo University of Agriculture and Technology, Japan (Oral).
18. A. T. Luu, Zs. Kajcsos, N. D. Thanh, T. Q. Dung, K. Lázár, K. Havancsák, G. Huhn, Zs. E. Horváth, L. T. Son, P. T. Phuc, T. D. Tap , Multi-Wall Carbon Nanotubes investigated by Positron Annihilation Techniques and Microscopies, International Conference on Positron annihilation 15th, 2009, 01.18-23, Kolkata, India, (Oral).
National publications
1. Chau Van Tao, Trinh Hoa Lang , Nguyen Anh Tuan, Le Hoang Chien, Nguyen Huu Loc, Calculating the positron – electron correlation energy in ZnO with the modified single wave function for positron, Science and Technology Development Journal, Vietnam National University – Ho Chi Minh City, 14, 78-86, 2011.
2. Tran Duy Tap, A. Kawasuso, M. Maekawa, Chau Van Tao , L. A. Tuyen, N. D. Thanh, N. A. Tuan, D. D. Khiem, and N. A. Khoa, Characterization of defects in Si by helium implantation using a slow positron beam, Nuclear Science and Technology, Vietnam Atomic Energy Society, 3, 1-7, 2009.
3. Tran Duy Tap, Chau Van Tao , D. T. Hien, I. Takahisa, L. C. Hao, L. A. Tuyen, M. Nomachi, N. A. Tuan, S. Kanamaru, V. H. Hai, Y. Kono, and Y. Otake, The BiPo decay experiment, Nuclear Science and Technology, Vietnam Atomic Energy Society, 4, 19-27, 2009.
4. Chau Van Tao, Nguyen Anh Tuan, Trinh Hoa Lang , Tran Duy Tap, “Positron – Electron Correlation Energy in ZnO Using Quantum Monte Carlo Method”, Nuclear Science and Technology, 2, 1-11, 2009.
5. Châu Văn Tạo, Trịnh Hoa Lăng , Khảo sát năng lượng tương quan electron-positron trong kim loại Cu (FCC), Tạp chí Phát triển Khoa học và Công Nghệ, ĐHQG Tp.HCM, 10, 27-32, 2007.
Domestic conferences
1. Tran Duy Tap, Nguyen Hoang Anh , Luong Tuan Anh, Huynh Thi Hai, Luu Anh Tuyen, Do Duy Khiem, Nguyen Quoc Hien, Study on the effects of grafting degree on lamellar structures of graft-type polymer electrolyte membrane for fuel cell application, Hội nghị vật lý chất rắn và khoa học vật liệu toàn quốc lần thứ 9, (SPMS-2015), 8-10/11/2015, Tp.HCM (Oral).
2. Nguyen Hoang Anh, Tran Duy Tap , Huynh Thi Hai, Chau Van Tao, Luu Anh Tuyen, Do Duy Khiem, Nguyen Quoc Hien, Study on nanohole structure – gas permeation relationship of graft-type polymer electrolyte membrane for fuel cell application, Hội nghị vật lý chất rắn và khoa học vật liệu toàn quốc lần thứ 9, (SPMS-2015), 8-10/11/2015, Tp.HCM (Oral).
3. Huynh Thi Hai, Tran Duy Tap , Nguyen Hoang Anh, Dao Van Quoc, “Determination of interfacial structures of graft-type polymer electrolyte membrane for fuel cell application: a modified Porod’s law approach”, the 9th National Conference on Condensed Matter Physics and Materials Science, (SPMS-2015), 8-10/11/2015, Ho Chi Minh(Oral).
4. Nguyen Hoang Anh, Tran Duy Tap , Doan Van Quoc, Huynh Thi Hai, Luong Tuan Anh, Nguyen Thi My Da, Shin-ichi Sawada, Shin Hasegawa, Yosuke Katsumura, Yasunari Maekawa, Structure analysis of the graft-type proton exchange membranes using small-angle x-ray scattering in the high-q range for fuel cell application, Hội nghị khoa học và công nghệ hạt nhân toàn quốc lần thứ XI, 5-7/8/2015, Đà Nẵng (Oral).
5. Nguyen Hoang Anh, Tran Duy Tap , Tran Thi Thuy Trang, Huynh Thi Truc Van, Chau Van Tao, Luu Anh Tuyen, Do Duy Khiem, Shin-ichi Sawada, Shin Hasegawa, Yasunari Maekawa, Study of ortho-positronium formation in grafted-type polymer electrolyte membranes for fuel cell application, Hội nghị khoa học và công nghệ hạt nhân toàn quốc lần thứ XI, 5-7/8/2015, Đà Nẵng (Oral).
6. Tran Duy Tap, Nguyen Hoang Anh , Chau Van Tao, Luu Anh Tuyen, Do Duy Khiem, Phan Trong Phuc, La Ly Nguyen, Atsuo Kawasuso, Masaki Maekawa, Characterization of defects in 4h-sic by hydrogen implantation using positron annihilation spectroscop, Hội nghị khoa học và công nghệ hạt nhân toàn quốc lần thứ XI, 5-7/8/2015, Đà Nẵng (Poster).
7. Tran Duy Tap, Nguyen Hoang Anh , Luong Tuan Anh, Phan Huu Trong, Nguyen Thi Ngoc Huyen, Shin-ichi Sawada, Shin Hasegawa, Yosuke Katsumura, Yasunari Maekawa, Lamellar structure investigation of graft-type polymer electrolyte membranes using small- and ultra small-angle x-ray scattering for fuel cell application, Hội nghị khoa học và công nghệ hạt nhân toàn quốc lần thứ XI, 5-7/8/2015, Đà Nẵng (Oral).
8. Trinh Hoa Lang, Chau Van Tao , Le Hoang Lam, Tran Quoc Dung, Tran Duy Tap, Luu Anh Tuyen, Positron annihilation in mordenite zeolite, Hội nghị khoa học và công nghệ hạt nhân toàn quốc lần thứ XI, 5-7/8/2015, Đà Nẵng (Oral).
9. Trịnh Hoa Lang, Le Cong Hao, Chau Van Tao , Huynh Dinh Chương, Truong Thi Hong Loan, Nguyen Thi My Da, Le Quoc Bao, Le Thi Ngoc Trang, Tran Kim Tuyet, Nguyen Thi Truc Linh, Concrete density measurement using gamma backscattering technique, Hội nghị khoa học và công nghệ hạt nhân toàn quốc lần thứ XI, 5-7/8/2015, Đà Nẵng (Poster).
10. Tran Duy Tap, Pham Minh Hien, Truong Thi Hong Loan, Phan Le Hoang Sang, Luu Anh Tuyen, Study of Lamellar Structures of Graft-Type Fluorinated Proton Exchange Membranes by Small-Angle X-Ray Scattering: Preparation procedures and Grafting Degree Dependence for Fuel Application, Hội nghị khoa học lần IX-2014, 21/11/2014, Trường ĐHKHTN, Tp.HCM (Oral).
11. Tran Duy Tap, Pham Minh Hien, Truong Thi Hong Loan, Phan Le Hoang Sang, Luu Anh Tuyen, Structure Analysis of Graft-Type Fluorinated Proton Exchange Membranes by Small-Angle X-Ray Scattering in the High-q Range, Hội nghị khoa học lần IX-2014, 21/11/2014, Trường ĐHKHTN, Tp.HCM (Poster).
12. Tran Duy Tap, Chau Van Tao , Do Duy Khiem, Luu Anh Tuyen, Nguyen Duc Thanh, Trinh Hoa Lang, Cacullation of some basic positron-related characteristics of semiconductors, Hội nghị khoa học và công nghệ hạt nhân toàn quốc lần thứ VIII, 20-21/8/2009, Nha Trang (Poster).
13. T. D. Tap, C. V. Tao, T. H. Lang , T. P. Dung, P. L. H. Sang, L.A. Tuyen, A. Kawasuso, M. Maekawa, Zs. Kajcsos, Characterization of defects in 4H-SiC by Hydrogen implantation using Positron annihilation spectroscopy, Hội nghị khoa học lần VI-2008, Trường ĐHKHTN, Tp.HCM (Oral).
14. T. D. Tap, C. V. Tao, T. H. Lang , T. P. Dung, P. L. H. Sang, L. A. Tuyen, A. Kawasuso, M. Maekawa, Effects of helium implantation in highly doped silicon using a slow positron beam, Hội nghị khoa học lần VI-2008, Trường ĐHKHTN, Tp.HCM (Poster).
15. T. H. Lang, C. V. Tao , T. D. Tap, T. P. Dung, “Determination of Enhancement Factor of electron – positron Annihilation in metal Cu( FCC)”, Hội nghị khoa học và công nghệ hạt nhân toàn quốc lần thứ VII, 30-31/8/2007, Đà Nẵng (Oral).
16. C. V. Tao, T. H. Lang , T. D. Tap, T. P. Dung, “DFT caculations of correlated electron – positron energy in metal Cu (FCC)”, Hội nghị khoa học lần V-2006, Trường ĐHKHTN, Tp.HCM (Oral).
APPLICATIONS OF NUCLEAR PHYSICS - NUCLEAR ENGINEERING
IN ENVIRONMENTAL RADIOACTIVITY AND ISOTOPE HYDROLOGY MEASUREMENT
I. RESEARCH INTEREST
Analysis of radioisotopes in environmental samples using the gamma spectrometer
Methods of self-absorption correction, sum-coincidence correction, background reduction for gamma spectroscopy using HPGe detector are developed for precise radioisotopes’ concentrations analysis, improving the ability of detecting environmental as well as artificial radioisotopes in soil, air, and water samples, etc… Additionally, determining the degree of confidence of experimental results is studied due to the support and comparing with simulating results by using MCNP, PENELOPE, and GEANT4.
Analysis of radioisotopes in environmental samples using the alpha spectrometer
Radiochemistry methods and procedures are studied, applied and developed in order to investigate environmental radioisotopes using alpha spectroscopy with PIPS (Passivated Implanted Planar Silicon) detectors. Some studies of this field are: the study about features of analysis system, ranges of alpha particles, the study of creating uranium standard source, proposing optimum analysis procedures, investigation of radioisotopes226Ra in bottled water and210Po as well as210Pb in cigarettes, tea leaves, fertilizers produced in Vietnam.
Analysis of elements in environmental samples using X-ray fluorescence spectrometer and neutron activation analysis.
Analysis of elements for product quality testing, materials and biological samples, analysis of trace elements in the soil and in the ecosystem components, analysis and evaluation of the toxic elements in food, food, environmental pollution, ...
Figure 3. Sample transfer system in neutron activation analysis
II. RESULTS
Result of improving minimum detection activity
Result of self-absorption correction
Result of evaluating gamma spectrometry by simulation
Analyzing of 210Po in cigarette and 226Ra in bottled water
III. PUBLICATIONS
[1]. Hao, L.C., Tao, C.V., Nhon, M.V., “Methods for thin foil thickness determination by using alpha spectroscopy”, Kerntechnik, 03, 135-137, 2010.
[2]. Hao, L.C., Tao, C.V., Dong, N.V., Nghi, H.N., Dung, P.T., Thong, N.V., “Rapid preparation of Uranium and Thorium alpha sources by electroplating technique”, Kerntechnik, 06, 381-385, 2010.
[3]. M.-C. Lépy, Chau Van Tao, Tran Thien Thanh et al, “Intercomparison of Methods for Coincidence summing corrections in gamma ray spectrometry”, Applied Radiation and Isotopes, Vol. 68 Issues 7-8, 1407-1412, 2010.
[4]. T.T. Thanh, L. Ferreux, M.C. Lépy, C.V. Tao, “Determination activity of radionuclides in marine sediment by gamma spectrometer with anti-cosmic shielding”, Journal of Environmental radioactivity Vol 101, Issue 9,780-783, 2010.
[5]. H. T. Phuong, M. V. Nhon, V.T.T. Trang and E. Ishistuka, “Application of Pade Approximation for Calculation Of Epithermal Neutron Self-Shielding Factors Of Some Materials Dealing With Doppler Broadening Effects”, Applied Radiation and Isotopes 68, 1177-1179, 2010.
[6]. Hao, L.C., Tao, C.V., Dong, N.V., Thong, N.V., Linh, D.M., “Determination of natural uranium, thorium and radium isotopes in water and soil samples by alpha spectroscopy”, Kerntechnik, 04, 285-191, 2011.
[7]. M.-C. Lépy, Chau Van Tao, Tran Thien Thanh et al., “Intercomparison of Methods for Coincidence summing corrections in gamma ray spectrometry – Part II (Volume sources)”, Applied Radiation and Isotopes, Vol 70, 2012.
[8]. T. T. Thanh, C. V. Tao, T. T. H. Loan, M. V. Nhon, H. D. Chuong and B. H. Au, “A detailed investigation of interactions within the shielding to HPGe detector response using MCNP code”, Kerntechnik 77/6, 458-461, 2012.
[9]. T. T. Thanh, C. V. Tao, H. D. Chuong and B. H. Au, “Development of program DETSIM to simulate detector’s full energy peak efficiency”, Kerntechnik 77/6, 449-452, 2012.
[10]. H. T. Phuong, M. V. Nhon, L. D. H. Oanh, “Development of k0-INAA standardization method by neutron activation with Am–Be source”, Applied Radiation and Isotopes, 70, 478-482, 2012.
[11]. Thien Thanh Tran, Laurent Ferreux, Marie-Christine Lepy, Chau Van Tao, Sylvie Pierre (2013), Characterization of a cosmic suppression spectrometer, Applied Radiation and Isotopes, 114-118.
[12]. Laurent Ferreux, Sylvie Pierre, Tran Thien Thanh, Marie-Christine Lepy (2013), Validation of efficiency transfer for Marinelli geometries Applied Radiation and Isotopes, 67-70.
[13]. Le Cong Hao, Miyako Nitta, Ryoko Fujiyoshi, Takashi Sumiyoshi, Chau Van Tao (2013), “Radiocesium Fallout in Surface Soil of Tomakomai Experimental Forest in Hokkaido due to the Fukushima Nuclear Accident”, Water, Air, & Soil Pollution , 224: 1028.
[14]. Ngo Quang Huy, Do Quang Binh, Vo Xuan An, Truong Thi Hong Loan, Nguyen Thanh Can, “Self-absorption correction in determining the U-238 activity of soil samples via 63.3 keV gamma ray using MCNP5 code, Applied Radiation and Isotopes, 71 (2013) 11-20.
[15]. T.T. Thanh, T.T. H. Loan, M.V. Nhon, C.V. Tao (2014), Improvement passive shielding to background reduction: application to determinate radioactivity at low-energy gamma rays, Kerntechnik, Vol 79, No 3, 247-252.
[16]. Thuy-Ngan N. TRAN, Cong-Hao LE, Van-Tao CHAU (2014), 210Po and 210Pb Activity Concentrations in Cigarettes Produced in Vietnam and Their Estimated Dose Contribution Due to Smoking, Proceedings of The 12th Asia Pacific Physics Conference (APPC12), Makuhari – Japan, 2013, JPS Conf.Proc. 1, 019002.
APPLICATION OF NUCLEAR PHYSICS - NUCLEAR ENGINEERING
IN INDUSTRY
I. RESEARCH ON NUCLEAR APPLICATION IN INDUSTRY
Nuclear application in industry: research and develop methods to improve industrial inspection systems for higher accuracy requirement, especially in construction engineering, such as to measure the thickness and density of materials, to verify essential weld quality, to track leakage from piping systems, or corrosion of processing equipment, etc. Justifying the credibility of an experiment by Monte Carlo simulation using MCNP, PENELOPE, and GEANT4 software.
II. R ESULTS
Result of calculating Compton cross section
Figure 1: Compton cross section of steel
Result of calculating for saturation curve of material
Figure 2: Saturation curve of aluminum
Result of evaluating gamma scattering by simulation
Figure 3: Comparison of spectra
III. PUBLICATIONS
[1]. Hoang Duc Tam, Huynh Dinh Chuong, Tran Thien Thanh, Vo Hoang Nguyen, Hoang Thi Kieu Trang, Chau Van Tao, Advanced gamma spectrum processing technique applied to the analysis of scattering spectra for determining material thickness, Journal of Radioanalytical and Nuclear Chemistry, Vol 303/1, 693-699, 2015.
[2]. Duc-Tam HOANG, Thien-Thanh TRAN, Bao-Tran LE, Kim-Tuyet TRAN, Dinh-Chuong HUYNH, Hoang-Nguyen VO and Van-Tao CHAU,First results of saturation curve measurements of heat-resistant steel using Geant4 and MCNP5 codes, JPS Conf. Proc Volume 6, 2015.
[3]. Huynh Thi Yen Hong, Nguyen Thi Tram, Vu Ngoc Ba, Nguyen Ngoc Lam, Lu Anh Huong, Huynh Dinh Chuong, Le Thi Ngoc Trang, Bui Tuan Khai, Tran Kim Tuyet, Hoang Duc Tam, Tran Thien Thanh, Chau Van Tao, Evaluation of suaturation curve of Aluminum using Geant4 code, Proceedings of the 3rd academic conference on natural science for master and PhD students from Asean countries, VNU-HCM publishing house, 280-284, 2014.
[4]. Hoang Duc Tam, Vo Hoang Nguyen, Tran Thanh Phi, Nguyen Thi Binh, Nguyen Hien Dang, Huynh Dinh Chuong , Le Thi Ngoc Trang, Tran Kim Tuyet, Vu Tuan Minh, Tran Thien Thanh and Chau Van Tao, Experimental Investigation of Detector Collimator Response on Gamma Scattering Spectrometer, Proceedings of RCMME2014, Bach khoa publishing house, 471-476, 2014.
[5]. Tran Thien Thanh, Lam Thu Van, Tran Thi Thu Suong, Tran Trung Tin, Huynh Thi Yen Hong, Vo Hoang Nguyen, Huynh Dinh Chuong , Le Thi Ngoc Trang, Tran Kim Tuyet, Le Bao Tran, Hoang Thi Kieu Trang, Hoang Duc Tam and Chau Van Tao, Efficiency Calibration of Point Sources inside Radioactive Waste Drum by Monte Carlo Simulation, Proceedings of RCMME2014, Bach khoa publishing house, 477-481, 2014.
NUCLEAR THEORY AND PARTICLE PHYSICS
I. RESEARCH INTERESTS
Nuclear reaction: The nuclear reactions with a wide range of bombarding energies are researched by using the quantum scattering theory, the optical model, the folding model, the distorted wave Born approximation (DWBA), the coupled channel method (CC) and the classical approximations,… In detail:
+ Research in the elastic scattering processes in the medium and high ranges of energies to compare and explain the experimental data.
+ Study on the nuclear reactions such as transfer reactions, fusion reactions at very low energies which are typical for astrophysics interest. With the obtained results, we explain and evaluate the nuclear evolution in stars.
Nuclear structure: The shell model, the Fermi model and liquid drop model are studied and employed for exploration of the nuclear structure. In particular:
+ Study about the nuclear forces.
+ Calculate the energy levels of nucleons and the general characteristics of nuclei at far away the valley of stability.
Elementary particle theory: We are interested in studying the most fundamental questions about nature, such as: what is the source of particles’ masses, quantum theory of gravitation, the asymmetry of matter and antimatter in nature, etc. In the meantime, we are interested in experimental techniques in high energy physics performed at colliders such as the Large Hadron Collider and KEK. Our group also focuses on simulating the interactions of fundamental particles and analyzing experimental data in high energy physics. Specifically:
+ Research in the neutrinoless double beta decay of 48Ca.
+ Study of the jet quenching from Z+jet production in heavy ion collisions.
+ Study of muon-electron conversion, and Charged Lepton Flavor Violation process.
II. RESULTS
The reaction cross section of 4He from the optical model calculations
The elastic scattering data of the 12C + 12C reaction are measured in the energy range of 6 to 10 MeV* in comparison with the Optical Model (OM) and Couple Channel (CC) results. (*): Phys. Rev. C 22, 2462 (1980).
The shape of nuclei are obtained from monopole, dipole and quadrupole transitions
III. PUBLICATIONS
[1] Evidence of Wγγ production in pp collisions at sqrt(s) = 8 TeV and limits on anomalous quartic gauge couplings with the ATLAS detector, Nguyen Hai Duong, CERN-PH-EP 009, 2015.
[2] The investigation of neutron cross section with the energy range from 1 to 50 Mev for some near-spherical nuclei, Nguyen Tri Toan Phuc, Pham Thanh Quang, Le Hoang Chien, Chau Van Tao, the 11th national conference on nuclear science and technology, Vietnam Atomic Energy Institute, 2015.
[3] Applying the optical model to calculate the neutron cross-section, Phan Thanh Quang, Chau Van Tao, Le Hoang Chien, Nguyen Dien Quoc Bao, Pham Minh Quan, 9th Science Conference, HCMC University of Science, 2014.
[4] Measurement of the muon charge asymmetry in ppbar to W + X to mu nu + X events at sqrt{s} = 1.96 TeV, Hoang Thi Kieu Trang, Phys. Rev. D 88, 091102(R), 2013.
[5] Search for supersymmetry using events with three leptons, multiple jets, and missing transverse momentum with the ATLAS detector, Nguyen Hai Duong, ATLAS-CONF 2012, 108, 2012.
[6] Search for squarks and gluinos using final state with jets and missing transverse momentum with ATLAS experiment in 4.7/fb of sqrt(s)= 7 TeV proton-proton collision data, Nguyen Hai Duong, ATLAS-CONF 2012, 033, 2012.
[7] A new boson with a mass of 125 GeV observed with the CMS experiment at the Large Hadron Collider, Nguyen Hai Duong, Science 338, 1569-1575, 2012.
[8] Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC, Nguyen Hai Duong, Phys. Lett. B716, 30, 2012.
[9] Search for extra dimensions in the diphoton mass spectrum at the Large Hadron Collider, Nguyen Hai Duong, Phys. Rev. Lett. 108, 111801, 2012.
Current research activities:
There are several current research activities carrying out at the Department, including:
(1) Nuclear theory and Particle physics,
(2) Applications of nuclear physics - nuclear engineering in Material Science,
(4) Applications of nuclear physics - nuclear engineering in Medical Biology,
(5) Applications of nuclear physcis - nuclear engineering in Industry,
