Radiation Physics and Chemistry最新文献_第2页

S values for a monkey computational model in diagnostic nuclear medicine procedures

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-19 DOI: 10.1016/j.radphyschem.2025.112549

Daniel D. Lee, Jae Won Jung

{"title":"S values for a monkey computational model in diagnostic nuclear medicine procedures","authors":"Daniel D. Lee, Jae Won Jung","doi":"10.1016/j.radphyschem.2025.112549","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112549","url":null,"abstract":"In the field of nuclear medicine, monkeys have been instrumental in advancing our understanding of how radioactive materials behave within a living organism. However, dosimetric data, including S values, for various source and target regions in monkey's anatomy and radionuclides remain limited. The current study is aimed to develop a library of S values by utilizing a computational monkey model in conjunction with Monte Carlo radiation transport methods. We developed a S value library through the following process. First, we computed specific absorbed fractions (SAFs) for 35 source organs and 35 target organs using the general-purpose Monte Carlo radiation transport code, MCNP6. Monte Carlo simulations were performed for both photons and electrons, covering 27 monoenergetic bins ranging from 0.001 to 10 MeV. Next, we derived the S values from the SAFs for photons and electrons by incorporating energy spectrum data for 299 radionuclides most commonly used in diagnostic nuclear medicine, as provided by ICRP Publication 107. The differences in self-irradiation S values for the large organs likely stem from the type of particles: positron/beta vs. gamma. Cross-irradiation S values mirror the trends seen in SAFs, particularly in relation to the inter-organ distances between source and target regions. The comparison of S values between the monkey models and ICRP reference human models suggests that the monkey model-based S values are unique and may not be surrogated by human model-based S values. This S value library is expected to be a valuable resource for estimating organ doses in monkeys when paired with radionuclide distribution data across their anatomy.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"58 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Evolution of radiation dose management in CT: Moving Beyond physical shielding

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-19 DOI: 10.1016/j.radphyschem.2025.112537

Haila Nasser A. Aloud, Salman Albeshan

引用次数: 0

A Monte Carlo simulation of Gamma ART-6000 devices to investigate beam characteristics in a homogeneous environment using Geant4 simulation toolkits

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-19 DOI: 10.1016/j.radphyschem.2025.112542

Bui Tien Hung, Tran Thuy Duong, Bui Ngoc Ha, Ho Quang Tuan

引用次数: 0

Raman measurements on gamma irradiated chestnut fruits

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-19 DOI: 10.1016/j.radphyschem.2025.112547

Amilcar L. Antonio, Sandra Cabo Verde, M. Fatima Cerqueira

{"title":"Raman measurements on gamma irradiated chestnut fruits","authors":"Amilcar L. Antonio, Sandra Cabo Verde, M. Fatima Cerqueira","doi":"10.1016/j.radphyschem.2025.112547","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112547","url":null,"abstract":"Irradiation for food preservation is on use in several countries for different types of foods: fish, meat, vegetables, etc., with its application accepted and regulated by national and international food safety agencies. In this work an irradiation preservation process was applied on chestnut fruits, studying its impact on fruit characteristics. Here, we applied Raman scattering measurements on two varieties of non-irradiated and irradiated chestnut fruits at different irradiation doses (1, 2 and 5 kGy), to identify the main peaks associated with main molecular structures present on chestnut fruits and their behavior (intensity, peak position and full width at half maximum-FWHM) with irradiated doses. The intensity ratios of relevant peaks were used to correlate the obtained results with the dose and/or variety. With the focus of this research centered not only on structural changes after processing but also on the possibility to use this tool to easily distinguish between varieties and/or processed fruits by irradiation. From the results presented in this study, following the appropriate Raman peaks, it was possible to clearly identify the chestnut fruits varieties and also to discriminate irradiated from non-irradiated samples.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"28 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Long term in-vivo dosimetry result for bilateral oppose extended source to surface distance (SSD) total body irradiation

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-18 DOI: 10.1016/j.radphyschem.2025.112541

Biplab Sarkar, Anirudh Pradhan

引用次数: 0

Free volume impact on ionic conductivity of PVdF/GO/PVP solid polymer electrolytes via positron annihilation approach

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-18 DOI: 10.1016/j.radphyschem.2025.112539

Mesut Yılmazoğlu, Hikmet Okkay, Ufuk Abaci, Emre Tekay, Ozan Coban, Sümeyye Veziroğlu, Ayse Yumak Yahsi, Cumali Tav, Ugur Yahsi

{"title":"Free volume impact on ionic conductivity of PVdF/GO/PVP solid polymer electrolytes via positron annihilation approach","authors":"Mesut Yılmazoğlu, Hikmet Okkay, Ufuk Abaci, Emre Tekay, Ozan Coban, Sümeyye Veziroğlu, Ayse Yumak Yahsi, Cumali Tav, Ugur Yahsi","doi":"10.1016/j.radphyschem.2025.112539","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112539","url":null,"abstract":"This study reports the effects of free volume (FV) profiles on the ionic conductivities of PVdF/GO/PVP ternary polymer electrolytes using positron annihilation lifetime spectroscopy (PALS). The electrolytes were characterized by various tests such as FTIR, XRD, TGA-DTG, SEM, contact angle and DMA. FV profiles were evaluated by o-Ps lifetime (<ce:italic>τ₃</ce:italic>), intensity (<ce:italic>I</ce:italic><ce:inf loc=\"post\">3</ce:inf>) and FV fractions (<ce:italic>f</ce:italic><ce:inf loc=\"post\"><ce:italic>υ</ce:italic></ce:inf>). PVdF exhibits a proton conductivity of 2.1 × 10⁻<ce:sup loc=\"post\">5</ce:sup> S/m at 80 °C. However, the introduction of GO leads to a decrease in conductivity, with PVdF/GO showing 1.7 × 10⁻<ce:sup loc=\"post\">5</ce:sup> S/m at 80 °C. The presence of PVP in PVdF/GO/PVP10 and PVdF/GO/PVP30 creates new FV spaces via hydrogen bonds and intermolecular interactions, expanding hydrophobic areas and increasing <ce:italic>I₃</ce:italic> values. PVP's high mobility and positive charge density reduce the <ce:italic>τ₃</ce:italic> values. In contrast, <ce:italic>I₃</ce:italic> and <ce:italic>f</ce:italic><ce:inf loc=\"post\"><ce:italic>υ</ce:italic></ce:inf> values decrease in PVdF/GO/PVP50, accompanied by a significant drop in <ce:italic>τ₃</ce:italic> values and the proton conductivity and dielectric constant peak at 6.1 × 10⁻<ce:sup loc=\"post\">2</ce:sup> S/m and 77.38, respectively. High PVP concentration may enhance interactions within the polymer matrix, forming a dense structure that, despite reduced FV, maintains or enhances proton mobility through alternative conduction pathways and increased polarization. This study emphasizes the balance of FV and dielectric behavior for efficient electrochemical processes.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"58 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interplay of irradiation stress and phase stabilizer in determining the direction of martensitic transformation in SS316

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-18 DOI: 10.1016/j.radphyschem.2025.112546

Sarita Ahlawat, Nandini Garg, K.K. Pandey, Velaga Srihari, Debdulal Kabiraj, Manju Bala, Sonu Hooda, Niharendu Choudhury, Aniruddha Biswas

引用次数: 0

Comparative analysis of proton depth dose distribution in the Snyder head phantom: FLUKA vs GEANT4 physics models

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-18 DOI: 10.1016/j.radphyschem.2025.112532

Mustafa Mohammad Rafiei, Alessandro Bartoloni, Sara Parsaei, Lidia Strigari

{"title":"Comparative analysis of proton depth dose distribution in the Snyder head phantom: FLUKA vs GEANT4 physics models","authors":"Mustafa Mohammad Rafiei, Alessandro Bartoloni, Sara Parsaei, Lidia Strigari","doi":"10.1016/j.radphyschem.2025.112532","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112532","url":null,"abstract":"Today, estimating ionizing radiation doses through simulations using Monte Carlo codes is essential in many fields, particularly space radiobiology. Simulations are engaging because they are risk-free and significantly more cost-effective than experimental methods. Consequently, various codes have been developed to transport a broad spectrum of charged and uncharged particles across an extensive energy range from several keV to hundreds of TeV and beyond. These codes have diverse physical models, enabling users to select the most appropriate one for their simulations. Assessing the differences between these models is crucial for accurately estimating radiation doses. In this study, three different physical models from GEANT4 11.1.3 (FTFP_BERT, FTFP_INCLXX, and FTF_BIC) and the physical model of FLUKA 4–4.0 were evaluated to determine the depth dose distribution of protons (0.1 GeV–10 GeV) within the Snyder head phantom. The findings reveal that varying physical models yield different dose values. The paper thoroughly investigates the relative differences in the results obtained from FLUKA and GEANT4, expressed as percentages.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"111 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on thermal neutron shielding effect of serpentine concrete (SC) 蛇纹石混凝土（SC）的热中子屏蔽效应研究

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-17 DOI: 10.1016/j.radphyschem.2025.112535

Yucheng Zhou, Xiaoming Chen, Yijian Zhan, Zhiyao Xue, Jifeng Hu, Xiaohe Wang, Mintao Zhu, Deliang Li

{"title":"Research on thermal neutron shielding effect of serpentine concrete (SC)","authors":"Yucheng Zhou, Xiaoming Chen, Yijian Zhan, Zhiyao Xue, Jifeng Hu, Xiaohe Wang, Mintao Zhu, Deliang Li","doi":"10.1016/j.radphyschem.2025.112535","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112535","url":null,"abstract":"Fourth-generation advanced reactor systems have extremely high safety and antinuclear radiation diffusion requirements. The material design of nuclear radiation shielding concrete in reactor construction is important. In this work, the thermal neutron shielding performance of serpentine concrete (SC) is examined for a thermal neutron reactor—the molten salt reactor project. The effects of thermal neutrons in different energy segments on the SC shielding are investigated using a photoneutron source (PNS) driven by a 15 MeV electron linear accelerator (LINAC) and Monte Carlo (MCNP) simulations. The results show that the difference between SC and normal concrete (NC) lies in its higher content of H, Fe and Mg; among these elements, the comprehensive cross sections of H and Fe are greater than those of the other main elements, and the thermal neutron shielding effect of SC is approximately 25% greater than that of NC. Due to the thermal neutron scattering (TNS) effect, the <0.01 eV thermal neutron transmission of concrete significantly increases, and the thermal neutron transmission difference of the low thickness concrete is significant and needs to be considered in engineering construction. This study provides support for the engineering construction of advanced reactors and is highly important for reducing the spread of nuclear radiation.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"122 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct creation of the relative stopping power maps from MRI images using a cycleGAN deep-learning network for proton therapy

IF 2.9 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-17 DOI: 10.1016/j.radphyschem.2025.112545

Hamid Omidi, Reza Faghihi, Mohammadreza Parishan, Mohammad Hossein Sadeghi

引用次数: 0