Peter Dimpfl successfully defended his thesis entitled “Monte Carlo Simulation of Thallium-Bromide Semiconductor Detector for Range Verification of a Carbon Ion Radiotherapy Beam Through Prompt Gamma-Ray Detection” on June 17, 2022. In this study, Monte Carlo simulations were completed to evaluate TlBr performance in the detection of prompt gamma rays generated from the irradiation of a Polymethyl methacrylate (PMMA) phantom with carbon ions. TlBr was able to detect the prompt Gamma-Ray profiles of three different materials (cortical bone, adipose tissue, PMMA) with correlation to actual simulated Bragg peaks. The committee includes Dr. Yu Kuang (chair), Dr. Zaijing Sun, Dr. Steen Madsen, and Dr. Hui Zhao.
Zaijing Sun (Health Physics and Diagnostic Sciences of UNLV) and his collaborators, Biswajit Biswal (Mathematics and Computer Sciences of SCSU), and Andrew Duncan (Material Sciences and Technology of SRNL) published an article “ADA: Advanced Data Analytics Methods for Abnormal Frequent Episodes in the Baseline Data of ISD” in the Journal of Nuclear Engineering and Technology. In this study, Advanced Data Analytics (ADA) methods are applied to the big data generated by the In-situ Decommissioning (ISD) Sensor Network Test Bed at the Savannah River Site. Advanced analytics engine, a framework of data analytics, feature engineering, and machine learning, is introduced to discover abnormal frequent episodes in the big datasets, which lead to the early indicators of ISD system failures.
Zaijing Sun (Health Physics and Diagnostic Sciences) recently gave a talk, “Nuclear Activation Analysis” at the Clark County School District (CCSD) seminar series “Science Speaks in Nevada.” The seminar series is organized by the Nevada State Science Teachers Association, which provides one-hour session seminars with local STEM experts designed to increase educator content knowledge about local science phenomena.
Christina Hall successfully gave a presentation entitled “Assessing Air Pollution with Spanish Moss as a Bioindicator in the Low Country of Savannah River Basin “at the 29th Annual Meeting of CIRMS “Trusting Radiation Science: Measuring what cannot be seen”. Her study indicated the correlations between the concentration of heavy metals in Spanish Moss and the level of air pollution in the rural, low traffic, and high traffic area.
Krishnakumar Divakar Nangeelil, Peter Dimpfl, Christina Hall and Zaijing Sun (all Health Physics & Diagnostic Sciences), along with colleagues from other institutions, recently presented papers at the On Methods and Applications of Radioanalytical Chemistry (MARC-XII) in Kailua Kona, Hawaii.
Nangeelil, Hall, Sun, and Wesley Frey presented a paper, “Assessing Air Pollution with Spanish Moss as a Bioindicator in the Low Country of Savannah River Basin.”
Dimpfl, Nangeelil, Sun, and Mayir Mamtimin presented a paper, “Forgery Identification of Hetian Jade with Instrumental Neutron Activation Analysis (INAA).”
Sun, Nangeelil, Qingseng Cai and Scott Lassell presented a paper, “Determining Trace Elements in Cottonseeds with Instrumental Neutron Activation Analysis (INAA).”
Dimpfl and Hall are graduate students.
Approved by the UNLV Marking and Office of Information Technology, a computer server coupled with the LYNX system is up and running with domain names as gamma.unlv.edu. The purpose of this domain is for remote gamma spectra collection and calibration. At this time, this domain can only be accessed on campus or any outside IP with a VPN account. Students can get “hands-on” experience with HPGe detectors and gamma spectroscopy without visiting the counting lab physically. Instead, they can click this link to see the gamma spectra remotely. This service is especially beneficial to students and instructors in nuclear sciences during the pandemic. Anyone interested in remote gamma spectra collection and calibration may contact Dr. Sun to establish a local account on the server.
Dr. Sun was invited by the Center for Neutron Research at the National Institute of Standard and Technology and presented his research “A Preliminary Study of the Organic and Nonorganic Food Ingredients with Instrumental Neutron Activation Analysis” at the NCNR Seminar series.
In the talk, he claimed that there is not much difference in the trace elements content between organic food and its conventional counterpart. The experiments and data show that INAA, as a nuclear technique, lacks the capability to probe the properties of compounds on the molecular level, which may be the real difference between organic and non-organic food.
Approved by the UNLV Marking and Office of Information Technology, two computer servers at HERD—Neutron and Photon—are up and running with domain names as neutron.unlv.edu and photon.unlv.edu. Both servers are running Ubuntu 20.04.3 LTS with Geant4, MCNPX, MariaDB, Matlab, and PHP. The purpose of these Linux servers is for Monte Carlo Simulations of Nuclear Processes and Radiation Spectra Collection and Analysis. At this time, both servers can only be accessed by SSH on campus. Anyone interested in MC simulations and Spectra Analysis can contact Dr. Sun to establish a local account on the servers.
Dr. Krishnakumar from the Indira Gandhi Centre for Atomic Research joined the group as a postdoc scholar. He received his Ph.D. in Physics in the area of radiation dosimetry from Bharathiar University, India. He has two decades of progressive professional work experience in health physics services, radiation detectors, gamma spectrometry, and radiation dosimetry. His involvement will strengthen our experimental activities in radiation detection and radiation dosimetry.
Dr. Sun and his colleagues in Carolina published an article “A Study of the Organic and Nonorganic Food Ingredients with Instrumental Neutron Activation Analysis” in Radiation Science and Technology. The article indicates that INAA is a sensitive radioanalytical tool to tell the elemental information on atomic or nuclear levels, however, as a nuclear technique, INAA lacks the capability to probe the properties of compounds on the molecular level, which may be the real difference between organic and nonorganic food.