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66th International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2022

作者： Boring, Ronald L. Ulrich, Thomas A. Park, Jooyoung Ahn, Jeeyea Lew, Roger Human Factors and Reliability Department Idaho National Laboratory Idaho FallsID United States Nuclear Engineering Ulsan National Institute of Science and Technology Ulsan Korea Republic of Virtual Technology and Design Program University of Idaho MoscowID United States

The Human Unimodel for nuclear Technology to Enhance Reliability (HUNTER) is simulation software for modeling the human portion of risk. HUNTER is built on a framework that separately models individual, task, and environmental factors. As a dynamic human reliability analysis (HRA) method, it affords advantages over traditional static or worksheet-based HRA approaches, such as the ability to model what-if scenarios and produce outputs beyond human error probabilities. In this paper, a validation was conducted of HUNTER task time estimates vs. empirical data collected for a steam generator tube rupture scenario. The HUNTER model produced using GOMS-HRA task-level primitives yielded timing results very closely aligned to empirical reference data for base and complex conditions, suggesting the tool holds promise for HRA requiring time estimation. © 2022 by Human Factors and Ergonomics Society. All rights reserved.

关键词： Ergonomics

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Radon exhalation rate from the latex pillows and its potential exposure to users

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Radiation Medicine and Protection 2024年第4期5卷 238-242页

作者： Phachirarat Sola Kanokporn Boonsirichai Santi Raksawong Ritiron Samran Pimprapa Chaijak Hirofumi Tazoe Chutima Kranrod Rawiwan Kritsananuwat Sattawat Jongjitklang Vichai Puripunyavanich Masahiro Hosoda Waleeporn Pongkua Shinji Tokonami Thailand Institute of Nuclear Technology(Public Organization) Sai MunOngkharakNakhon Nayok26120Thailand Physics Program Faculty of Science and TechnologyMuban Chombueng Rajabhat UniversityRatchaburi70150Thailand Department of Biology Faculty of ScienceThaksin UniversityPhatthalung93210Thailand Institute of Radiation Emergency Medicine Hirosaki UniversityHirosaki Aomori036-8564Japan Nuclear Engineering Chulalongkorn UniversityPatumwanBangkok10330Thailand

Objective:To develop a new system to accurately measure the radon exhalation from the latex pillows,and to estimate its potential exposure to ***:The new system is composed of two loops,the first loop is designed to trap background radon and thoron until their levels are nearly zero,and the second loop is the measurement loop to detect radon and thoron exhalation rates from the ***:The results showed that mass radon exhalation rated ranged from 0.18 Bq·kg^(-1)·h^(-1) to 0.78 Bq·kg^(-1)·h^(-1),with an average of(0.36±0.17)Bq·kg^(-1)·h^(-1) in the 9 *** average annual effective dose to users in a model room was estimated to be(15.51±12.69)μSv by assuming two pillows was ***:These results demonstrate that the new system can effectively measure radon exhalation rates in latex pillows,and the potential exposure to radon exhalating from the pillows is very low.

关键词： Radon exhalation Latex pillow Annual effective dose

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Quantum frequency mixing using an N-V diamond microscope

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Physical Review Applied 2024年第6期22卷 064051-064051页

作者： Samuel J. Karlson Pauli Kehayias Jennifer M. Schloss Andrew C. Maccabe Adam Libson David F. Phillips Guoqing Wang Paola Cappellaro Danielle A. Braje Massachusetts Institute of Technology (MIT) Lincoln Laboratory Lexington Massachusetts 02421 USA Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Current affiliation: Quantum Science and Engineering Program Harvard University Cambridge Massachusetts 02138 USA. Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

Wide-field magnetic microscopy using nitrogen-vacancy (N-V) centers in diamond can yield high-quality magnetic images of dc and ac magnetic fields. The unique combination of micron-scale spatial resolution of scalar or vector fields at room temperature and parallel camera readout make this an appealing technique for applications in biology, geology, condensed-matter physics, and electronics. However, while N-V magnetic microscopy has achieved great success in these areas, historically the accessible frequency range has been limited. In this paper, we overcome this limitation by implementing the recently developed technique of quantum frequency mixing. With this approach, we generate wide-field magnetic images of test structures driven by alternating currents up to 70 MHz, well outside the reach of dc and Rabi magnetometry methods. With further improvements, this approach could find utility in hyperspectral imaging for electronics power-spectrum analysis, electronics diagnostics and troubleshooting, and quantum computing hardware validation.

关键词： Quantum computers

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Elemental changes in heart and coronaries after breast cancer radiotherapy assessed by synchrotron radiation soft X-ray spectromicroscopy 44

Elemental changes in heart and coronaries after breast cance...

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44th Brazilian Workshop on nuclear Physics

作者： Pickler, A. Mendes, G. Tanure, T. Serqueira, L. Sena, G. Fidalgo, G. Colaço, M. Muñoz, E. Ferreira-Machado, S. Lau, C.C. Salata, C. Mantuano, A. Mota, C.L. Nascimento, A. de Almeida, C.E. Barroso, R.C. Physics Institute State University of Rio de Janeiro Brazil Radiological Science Department State University of Rio de Janeiro Brazil Laboratory of Cardiovascular Investigation Oswaldo Cruz Institute Brazil Nuclear Engineering Program Federal University of Rio de Janeiro Brazil

Radiotherapy (RT) plays a pivotal role in the treatment of breast cancer (BC) and various thoracic malignancies. Radiation induced heart disease (RIHD) is one such long term toxicity which can offset the improvement in cancer specific mortality. Long term normal tissue toxicity is becoming a bigger concern, as early diagnosis and the improvement in the treatment of these cancers has led to patients surviving longer. Our research group on Physics applied to biomedical sciences has been investigating the side effects of BC treatment (RT and chemotherapy) for more than ten years. The cardiac regeneration has been studied to better understand the damage that occurs following radiation procedures in the heart tissue after many thoracic cancer treatments. One possible complication is coronary artery disease induced by irradiation after radiotherapy in thoracic area. Studies on the structures of cardiac tissue and the distribution of low atomic weight element can help to understand mechanisms associated with damage to healthy tissue, as these are of fundamental importance to metabolism in biological systems. The present study aimed to elucidate how radiotherapy in the thoracic area causes damage in the coronary artery, and to verify the potential use of losartan in reducing, or even preventing, the side effects of irradiation in this artery. To assess elemental and morphological differences in aortic and coronary samples, the Low Energy X-Ray Fluorescence (LEXRF) technique using Synchrotron Radiation was employed. SR- LEXRF and scanning transmission X-ray microscopy measurements were carried out at the beamline TwinMic at Elettra Sincrotrone Triste, Italy. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Radiotherapy

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Effects of silver doping in the structural and optical properties of hematite (α-fe2o3) synthesized via chemical precipitation method 11th

Effects of silver doping in the structural and optical prope...

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11th International Conference on Key engineering Materials, ICKEM 2021

作者： Tan, Aldrin A. Lacuesta, Aldwin Christian T. Gili, Mon Bryan Z. Cervera, Rinlee Butch M. Materials Science and Engineering Program College of Science University of the Philippines Diliman Quezon City1101 Philippines Department of Mining Metallurgical and Materials Engineering University of the Philippines Diliman Quezon City1101 Philippines Philippine Nuclear Research Institute Department of Science and Technology Philippines

ISBN: (纸本)9783035738872

Hematite (α-Fe2O3) is a low-cost n-type semiconductor with significant absorption of visible light owing to its low bandgap energy of 2.1 eV. The wide applications of hematite in renewable energy and environmental remediation continuously entice more studies. However, the low absorbance of solar energy in the UV-range significantly limits the efficiency of many photocatalytic materials. In this study, we tried to dope α-Fe2O3 with silver via chemical precipitation method to lower the bandgap energy and widen its absorbance. The effects of doping hematite with Ag on the structure, morphology, elemental composition, and optical absorbance were determined by characterizing the samples via X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, and UV-Vis spectroscopy, respectively. It was observed from the XRD patterns that the α-Fe2O3 crystallizes in hexagonal structure with lattice parameters a = 5.0380 Å and c = 13.7720 Å for the pure α-Fe2O3. Doping with 0.1M and 0.2M AgNO3 leads to a greater value of the lattice parameters indicating successful doping. SEM images show that the hematite formed was composed of particles with irregular shapes that have sizes in the range 0.865-0.883 μm. Excess silver particles were deposited on the surface of hematite. UV-Vis spectra show that there is a red-shift in the absorption band of the Ag-doped hematite. A notable decrease in the bandgap energy of the undoped α-Fe2O3 was observed from ~2.2eV to ~2.0eV with the increase in the amount of the dopant in the hematite as determined using Tauc’s plot. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Hematite

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Benefits and drawbacks of radiofrequency ablation via percutaneous or minimally invasive surgery for treating hepatocellular carcinoma

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World Journal of Gastrointestinal Surgery 2024年第11期16卷 3400-3407页

作者： Ching-Lung Hsieh Cheng-Ming Peng Chun-Wen Chen Chang-Hsien Liu Chih-Tao Teng Yi-Jui Liu Department of Computer Science and Information Engineering Feng Chia UniversityTaichung 40724Taiwan Department of Surgery Chung Shan Medical University HospitalTaichung 40201Taiwan School of Medicine Chung Shan Medical UniversityTaichung 40201Taiwan Department of Radiology Taichung Armed Forces General HospitalTaichung 406Taiwan Department of Medical Imaging and Radiological Sciences Central Taiwan University of Science and TechnologyTaichung 406Taiwan Department of Radiology School of MedicineNational Defense Medical CenterTaipei 11490Taiwan Department of Medical Imaging China Medical University Hsinchu Hospital and China Medical UniversityHsinchu 302Taiwan Institute of Nuclear Engineering and Science National Tsing Hua UniversityHsinchu 300Taiwan Department of Radiology Nantou Hospital of the Ministry of Health and WelfareNantou 540Taiwan Master’s Program of Biomedical Informatics and Biomedical Engineering Feng Chia UniversityTaichung 407Taiwan Department of Automatic Control Engineering Feng Chia UniversityTaichung 407Taiwan

The management of early stage hepatocellular carcinoma(HCC)presents significant *** radiofrequency ablation(RFA)has shown safety and effectiveness in treating HCC,with lower mortality rates and shorter hospital stays,its high recurrence rate remains a significant ***,achieving improved survival solely through RFA is challenging,particularly in retrospective studies with inherent *** is commonly used for guiding percutaneous RFA,but its low contrast can lead to missed tumors and the risk of HCC *** enhance the efficiency of ultrasound-guided percutaneous RFA,various techniques such as artificial ascites and contrast-enhanced ultrasound have been developed to facilitate complete tumor *** invasive surgery(MIS)offers advantages over open surgery and has gained traction in various surgical *** studies suggest that laparoscopic intraoperative RFA(IORFA)may be more effective than percutaneous RFA in terms of survival for HCC patients unsuitable for surgery,highlighting its ***,combining MIS-IORFA with these enhanced percutaneous RFA techniques may hold greater significance for HCC treatment using the MIS-IORFA *** article reviews liver resection and RFA in HCC treatment,comparing their merits and proposing a trajectory involving their combination in future therapy.

关键词： Percutaneous radiofrequency ablation Minimally invasive surgery Hepatocellular carcinoma Intraoperative radiofrequency ablation Contrast-enhanced ultrasound

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Quantifying Environmental Radiation: Comparative Analysis of Monitoring Tools in Indonesia's Highest Radiation Area

SSRN

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SSRN 2024年

作者： Abdullah, Adi Rahmansyah Amir Permana, Sidik Srigutomo, Wahyu Maulana, Alan Seno, Haryo Purnama, Dikdik Sidik Rasito Humolungo, Ismail Zulfahmi Doctoral Program in Nuclear Engineering Department Bandung Institute of Technology Jl. Ganesha No. 10 Bandung Indonesia Master Program in Nuclear Science and Engineering Department Bandung Institute of Technology Jl. Ganesha No. 10 Bandung Indonesia Physics Department Bandung Institute of Technology Jl. Ganesha No. 10 Bandung Indonesia Indonesia’s National Research and Inovation Agency Jl. Tamansari No. 71 Bandung Indonesia

We employed three radiation detection devices: NaI(Tl) Scintillator, Geiger Muller Counter (GMC), and Electronic Personal Dosimeter (EPD) in highest natural background radiastion area in Inonesia. Direct measurements conducted with these three devices were validated by measuring radionuclide activities in the soil using HPGe Gamma Spectrometry. Among these three devices, two of them measure ambient dose equivalent (H*(10)), while one measures personal dose equivalent (Hp(10)). The measurement results indicating average H*(10) values of 0.457 µSv/h from NaI(Tl) Scintillator data and 0.769 µSv/h from GMC data, while the average Hp(10) value measured by EPD shows 0.986 µSv/h. The measurement of H*(10) by GMC is 45% higher than that of the NaI(Tl) Scintillator. This difference is also evident from the degenerate 2D map, where GMC data highlights locations of high flux gamma ray anomalies more clearly. This suggests that both devices exhibit different efficiencies under high gamma radiation exposure, with GMC showing better efficiency. However, under conditions of high radiation exposure, phenomena such as saturation may affect the performance of the device. The difference in measurement results does not indicate that one device is superior to the other;the naturally high radiation exposure conditions in the research environment affect the performance of both devices. Meanwhile, in the measurement of Hp(10) by EPD, it was found that the Hp(10) readings are higher than H*(10), which should not happen considering Hp(10) depends on the incident angle of radiation. The EPD detector type allows for the detection of radiation at low energies, but if it is not calibrated at this energy level, it might cause overreading when lower energy radiation, such as X-rays, is detected. Dead time and saturation may occur in environments with high background radiation, causing the detector readings to be less than ideal. © 2024, The Authors. All rights reserved.

关键词： Gamma rays

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900 MHz RF Power Rectifier Based on Ultra-low Turn-on Voltage Quasi-vertical GaN Schottky Diode

900 MHz RF Power Rectifier Based on Ultra-low Turn-on Voltag...

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Wireless Power Week (WPW)

作者： Xiaochen Yu Ya-Xun Lin Ivona Z. Mitrovic Steve Hall Der-Sheng Chao Jenq-Horng Liang Yi Huang Ta-Jen Yen Jiafeng Zhou International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu Taiwan Department of Electrical Engineering and Electronics University of Liverpool Liverpool United Kingdom Nuclear Science and Technology Development Center National Tsing Hua University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan

ISBN: (数字)9798350349139

ISBN: (纸本)9798350349146

This paper presents a 20 W high-power RF-to-DC rectifier that can be applied to wireless power transfer (WPT) systems. To address the power limitations of conventional diodes, a rectifier is designed based on a gallium nitride (GaN) integrated circuit (IC) quasi-vertical Schottky barrier diode (SBD). Leveraging the advantages of high mobility, wide bandgap, and saturation velocity of the GaN, significant benefits of the diode have been derived, with an ultra-low turn-on voltage of 0.23 ± 0.005 V (at 1 A/cm 2 ) and a high breakdown voltage of 180 V, to improve the rectification performance. Using this diode, a high-power rectifier with a wide input power range and high efficiency is developed. The proposed rectifier structure consists of a single-shunt self-developed diode and a topology with class-F harmonics control networks. It achieves a peak power conversion efficiency of 72.9% with an input power of 43 dBm at 900 MHz.

关键词： Wireless communication Integrated circuits Schottky diodes Wireless sensor networks Breakdown voltage Rectifiers Wireless power transfer

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Experimental Validation of Full Geometry MCNP Model of the UFTR based on NAA

Experimental Validation of Full Geometry MCNP Model of the U...

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2020 IEEE nuclear science Symposium and Medical Imaging Conference, NSS/MIC 2020

作者： Woldegiorgis, Surafel Nimmagadda, Jyothier Baciak, James The Nuclear Engineering Program The Department of Materials Science and Engineering The University of Florida GainesvilleFL32603 United States

ISBN: (纸本)9781728176932

The energy spectrum and spatial distribution of the neutron beam from a reactor is an essential component of designing experimentations utilizing the reactor as a radiation source. Obtaining such information requires the use of detailed MCNP model of the reactor and experimental validation procedures. After updating the MCNP model of the University of Florida Training Reactor (UFTR) to align it with the current core arrangement that uses low enriched uranium (LEU), both the radial neutron flux toward the beam ports and the energy spectrum at the reactor core were generated using the model. This was followed by experimental validations based on neutron activation analysis (NAA) by irradiating multiple activation foils. A constant ratio between MCNP and measured neutron flux values was obtained at multiple locations along the reactor's beam ports, showing that the model captures the spatial distribution of neutron flux profiles without a significant systematic error. The energy spectrum at the core was extracted using the Unfolding with MAXED and GRAVEL (UMG) software. The spectrum unfolded by both MAXED and GRAVEL algorithms display features expected in thermal reactor neutron energy distribution, i.e., thermal, fast or fission, and intermediate or slowing down regions. The thermal and epithermal neutron fluxes at the reactor core calculated from the spectrum unfolded by the MAXED n algorithm are 1. 56 ± 0. 12 × 1012 cm2s and 1. 98 ± 0. 01 × 1012 n sm2s, whereas the corresponding values calculated from the spectrum unfolded by the GRAVEL algorithm are 1. 50 ± 0. 12 × n 1012 n and 3. 74 ± 0. 21 × 1012. Following the cm2s cm2s experimental validation, the full geometry MCNP model of the reactor has been utilized for a neutron tomography research project and it will continue to benefit future projects using the reactor facility. © 2020 IEEE

关键词： Neutron flux

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Dosimetric Investigation of Six Ru-106 Eye Plaques by EBT3 Radiochromic Films and Monte Carlo Simulation

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Journal of Biomedical Physics and engineering 2023年第4期13卷 309-316页

作者： Arjmand, Mojtaba Ghassemi, Fariba Rafiepour, Payman Zeinali, Reyhaneh Riazi-Esfahani, Hamid Beiki-Ardakani, Akbar Ocular Oncology service Farabi Eye Hospital Tehran University of Medical Sciences Tehran Iran Retina & Vitreous Service Ocular Oncology Service Farabi Eye Hospital Tehran University of Medical Sciences Tehran Iran Department of Nuclear Engineering Shiraz University of Medical Sciences Shiraz Iran Department of Medical Physics Tabriz University of Medical Science Tabriz Iran Retina Service Farabi Eye Hospital Tehran University of Medical Sciences Tehran Iran Radiation Medicine Program Princess Margaret Cancer Centre University Health Network TorontoON Canada

Background: Ophthalmic brachytherapy using radioactive plaques is an effective technique for the treatment of uveal melanoma. Ru-106 eye plaques are considered as interesting issue due to their steep gradient dose. The pre-planning evaluation of dosimetric parameters is essential for the treatment planning system. Objective: The current study aims at providing dose distributions of six Ru-106 eye plaques (CCA, CCB, CGD, CIB, COB and COD) using radiochromic EBT3 film, Geant4 Monte Carlo toolkit and the treatment planning software (Plaque Simulator). Material and Methods: In this experimental study, an in house phantom was employed for depth dose measurements with EBT3 films. Also, Geant4.10.5 scoring mesh was implemented to obtain the 2D dose distribution of the plaques. The results were compared with Plaque Simulator software and the manufacturer’s (BEBIG) data. The gamma index criterion (3%/3 mm) was used to evaluate dose distributions obtained by the film measurements and Geant4 simulation. Results: A good agreement was achieved between simulation and experimental re-sults. Gamma index passing rate was 94.2%, 89.3%, 88.2%, 82.2%, 92.2% and 90.1% for CCA, CCB, CGD, CIB, COB and COD plaques, respectively. Absolute dose rate (mGy/ min) obtained by EBT3 film at the depth of 2 mm was 79.4 mGy/min, 81.0 mGy/min, 78.6 mGy/min, 62.2 mGy/min, 75.2 mGy/min and 81.2 mGy/min for CCA, CCB, CGD, CIB, COB and COD plaques, respectively. Conclusion: The measured dose distributions and lateral dose profiles may be utilized in the treatment planning system to cover clinical volumes such as the clinical target volume and the gross tumor volume. © 2023, Shiraz University of Medical sciences. All rights reserved.

关键词： Monte Carlo methods

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