Wei-Hsung Wang

Dr. Wei-Hsung Wang


Research Focus & Metrics

Academic Career Length

24Years (2003-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 January 2006
Verified
Conference Paper
Closed access
BSBlair Smith
Blair Smith
KIKenneth Lee Matthews II
Kenneth Lee Matthews II
ALAdam Lackie
Adam Lackie
WHWill H. Hill
Will H. Hill
WWWei-Hsung Wang
Wei-Hsung Wang
MCMichael L. Cherry
Michael L. Cherry
Small hand-held radiation detectors that can image a gamma-ray source and yet can be transported by a single operator could have numerous applications, either in medical intraoperative procedures or in nuclear security field work. We report on the design of a device intended for such applications and we present results of simulations that indicate expected performance for such a compact system. The device is electronically collimated and uses coincidence detection of Compton scattering interactions to locate distant unknown gamma ray emitters. Pixellated CZT semiconductor detectors are used, to allow a compact system with room-temperature operation. Detector energy resolution and detector geometry both impact performance, with detector geometry being a significant issue for this compact design. The useful field of view was found to be plusmn60deg in the zenith and azimuthal directions, measured outward from the front face of the detector. The radial field of view is determined by the sensitivity of the detectors, and depends upon the strength of the source. Suggestions for design improvements are discussed in our conclusions, with the goal of a hand-held device as the main stipulation.

1 November 2003 in Health Physics
Verified
Journal Article
Closed access
WWWei-Hsung Wang
Wei-Hsung Wang
The objective of this study was to establish a delayed air sampling method to verify the integrity of an existing HEPA filter system in a ventilated fume hood. (238U,232Th)O2 microspheres were generated to fabricate cement nuclear fuel pellets in a HEPA-filtered hood. To comply with the air effluent concentration limits by NRC, the capture efficiency of the HEPA filter was examined. An in-line isokinetic air sampling system was installed downstream of the HEPA filter. Utilizing a gas flow proportional counter, 212Pb was used as a surrogate to indicate any possible penetration of the (238U,232Th)O2 particles through the HEPA filter. Based on the experimental results, this delayed sampling method proved to be an easy and effective way to validate the integrity of the HEPA filter.

1 January 2006
Verified
Conference Paper
Closed access
ALAdam W. Lackie
Adam W. Lackie
KIKenneth Lee Matthews II
Kenneth Lee Matthews II
BSBlair M. Smith
Blair M. Smith
WHWill Hill
Will Hill
WWWei-Hsung Wang
Wei-Hsung Wang
MCMichael L. Cherry
Michael L. Cherry
We are developing an electronically-collimated gamma-ray detector for safety and security applications; localization is achieved using Compton-scatter coincidence detection. Electronic collimation allows the device to operate without physical collimation, providing high sensitivity while also allowing directional information to be determined. We report on the directional algorithm implemented for this system. Two approaches to direction reconstruction were evaluated; the first is filtered backprojection on a sphere using stereographic projection to implement filtering (Gunter, NSS-MIC2005). The second technique also backprojects events onto the sphere, then determines source location by the intersection of circumscribed rectangles for the backprojected cones. Algorithm performance was evaluated using randomly generated ideal Compton-scatter events from point sources for our detector geometry, as well as data from concurrent Monte Carlo simulations of a prototype system. Direction angles are calculated within 5% accuracy for source positions up to 45deg off-axis for the filtering approach and ~30deg for the circumscription approach. Error in calculated direction angles depends on the arbitrary diameter of the sphere; optimally, the sphere should intersect the source. The circumscription technique converges to an estimate of direction angles in ~50 events; the filtering approach requires ~1000 events. The two methods complement each other in speed and field-of-view.

1 February 2006 in Health Physics
Verified
Journal Article
Closed access
WWWei-Hsung Wang
Wei-Hsung Wang
JMJames D. McGlothlin
James D. McGlothlin
DSDeborah J. Smith
Deborah J. Smith
KMKenneth L. Matthews
Kenneth L. Matthews
This project incorporates radiation survey training into a real-time video radiation detection system, thus providing a practical perspective for the radiation worker on efficient performance of radiation surveys. Regular surveys to evaluate radiation levels are necessary not only to recognize potential radiological hazards but also to keep the radiation exposure as low as reasonably achievable. By developing and implementing an instructional learning system using a real-time radiation survey training video showing specific categorization of work elements, radiation workers trained with this system demonstrated better radiation survey practice.

14 May 2024 in Diagnostics
Verified
Journal Article
Open access
PDF file
YTYao-Kuang Tsai
Yao-Kuang Tsai
Li-Fan LinLi-Fan Lin
Li-Fan Lin
CCCheng-Yi Cheng
Cheng-Yi Cheng
CWChing-Yee Wong
Ching-Yee Wong
WWWei-Hsung Wang
Wei-Hsung Wang
ICI-Feng Chen
I-Feng Chen
Introduction: The biokinetics of radioiodine (RAI) in thyroid cancer patients are complex. This study aims to develop a practical approach for assessing RAI biokinetics to predict patient discharge time and estimate radiation exposure to caregivers. Methods: We retrospectively reviewed data from patients with differentiated thyroid carcinoma undergoing RAI treatment. Serial radiation dose rates were dynamically collected during hospitalization and fitted to a biexponential model to assess the biokinetic features: RAI uptake fraction of thyroid tissue (Ft) and effective half-life of extra-thyroid tissue (Tet). Correlations with 99mTc thyroid uptake ratio (TcUR), radiation retention ratio (RR), renal function, and body mass index (BMI) were analyzed. Results: Thirty-five patients were enrolled. The derived Ft was 0.08 ± 0.06 and Tet was 7.57 ± 1.45 h. Pearson’s correlation analysis revealed a significant association between Ft and both TcUR and RR (p < 0.05), while Tet correlated with renal function and BMI (p < 0.05). Conclusion: This novel and practical method assessing RAI biokinetics demonstrates consistency with other parameters and related studies, enhancing the model reliability. It shows promise in predicting an appropriate discharge time and estimating radiation exposure to caregivers, allowing for modifications to radiation protection precautions to follow ALARA principle and minimize the potential risks from radiation exposure.

24 July 2023 in VIETNAM JOURNAL OF EARTH SCIENCES
Verified
Journal Article
Closed access
PDF file
LPLan Luu Thi Phuong
Lan Luu Thi Phuong
BEBrooks B. Ellwood
Brooks B. Ellwood
SKSu Nguyen Khac
Su Nguyen Khac
WWWei-Hsung Wang
Wei-Hsung Wang
LDLam Doan Dinh
Lam Doan Dinh
MTMai Nguyen Thi
Mai Nguyen Thi
To clarify the paleoclimatic events in Northern Vietnam during the Late Quaternary, 132 Con Moong - Thanh Hoa cave sediment samples were collected to analyze magnetic susceptibility (χ), δ18O, and δ13C. Based on the tendency in the value of χ Con Moong's sediment, 14 climate zones that change continuously from warm to cold were identified. These climate zones also correspond to the changing trend of δ18O and δ13C. The period of 14 magnetic zones is referenced from the extrapolation of four 14C data. These alternating cold-warm χ sequences correspond to the Composite Reference Section (CRS) developed in Southern Europe from a χ zonation of multiple caves. The paleoclimate characteristics, including the Heinrich H2 and H1 climate events, the Bølling/Allerød, and Younger Dryas warm-cold events, were elucidated for Northern Viet Nam from ~28.000 to ~10.000 yr BP.