Radiation Physics and Chemistry最新文献_第4页

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

IF 2.8 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

{"title":"Long term in-vivo dosimetry result for bilateral oppose extended source to surface distance (SSD) total body irradiation","authors":"Biplab Sarkar , Anirudh Pradhan","doi":"10.1016/j.radphyschem.2025.112541","DOIUrl":"10.1016/j.radphyschem.2025.112541","url":null,"abstract":"<div><h3>Aim</h3><div>To report the results of in-vivo dose measurement using optically stimulated luminescent dosimeters (OSLDs) for bilateral opposed extended source-to-surface distance (SSD) total body irradiation (TBI).</div></div><div><h3>Materials and methods</h3><div>A total of 14 OSLDs were placed at various locations on the patient's body during TBI delivery. Additionally, a 0.6 cc Farmer chamber was placed at the leg bifurcation position. The doses recorded by the OSLDs and the Farmer chamber were noted and compared with the prescribed dose.</div></div><div><h3>Results</h3><div>A total of 67 patients were treated with extended SSD TBI, including 19 females and 48 males. Of these, 25 patients received a single fraction treatment, while the remaining 42 received treatment in 6 fractions. 31 patients were treated using a 6 MV beam, and the remaining 36 patients were treated using a 15 MV beam. Total number of treatment/OSLD measurement sessions were 277. The average measured dose using OSLDs across all positions and fractions was 220.9 ± 17.1 cGy, while the Farmer chamber measured a dose of 224.3 ± 11.5 cGy, with a deviation of 1.8%. The deviation from the prescribed dose was +10.4% for the OSLD and +12.5% for the chamber. The mean OSLD dose for all positions, all sessions, normalized to the 0.6 cc Farmer chamber dose, was 98.7 ± 1.9%.</div></div><div><h3>Conclusion</h3><div>The doses measured by the Farmer chamber and the OSLDs were comparable. However, both the chamber and OSLD doses differed from the prescribed dose of 2 Gy per fraction. This discrepancy is attributed to the inherent characteristics of the hourglass-like dose distribution from parallel opposed beams in extended SSD, where the surface to midline dose varies between 17% (6 MV: 42 cm separation) and 27% (15 MV: 62 cm separation). This is an inherent heterogeneity of the dose distribution and cannot be corrected. OSLDs are a reliable in-vivo dosimeter.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"229 ","pages":"Article 112541"},"PeriodicalIF":2.8,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035273","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

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

IF 2.8 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":"10.1016/j.radphyschem.2025.112539","url":null,"abstract":"<div><div>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 (<em>τ₃</em>), intensity (<em>I</em><sub>3</sub>) and FV fractions (<em>f</em><sub><em>υ</em></sub>). PVdF exhibits a proton conductivity of 2.1 × 10⁻<sup>5</sup> S/m at 80 °C. However, the introduction of GO leads to a decrease in conductivity, with PVdF/GO showing 1.7 × 10⁻<sup>5</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 <em>I₃</em> values. PVP's high mobility and positive charge density reduce the <em>τ₃</em> values. In contrast, <em>I₃</em> and <em>f</em><sub><em>υ</em></sub> values decrease in PVdF/GO/PVP50, accompanied by a significant drop in <em>τ₃</em> values and the proton conductivity and dielectric constant peak at 6.1 × 10⁻<sup>2</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.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"229 ","pages":"Article 112539"},"PeriodicalIF":2.8,"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 2.8 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 2.8 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":"10.1016/j.radphyschem.2025.112532","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"229 ","pages":"Article 112532"},"PeriodicalIF":2.8,"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 2.8 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":"10.1016/j.radphyschem.2025.112535","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"229 ","pages":"Article 112535"},"PeriodicalIF":2.8,"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 2.8 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

{"title":"Direct creation of the relative stopping power maps from MRI images using a cycleGAN deep-learning network for proton therapy","authors":"Hamid Omidi , Reza Faghihi , Mohammadreza Parishan , Mohammad Hossein Sadeghi","doi":"10.1016/j.radphyschem.2025.112545","DOIUrl":"10.1016/j.radphyschem.2025.112545","url":null,"abstract":"<div><h3>Background</h3><div>In MRI-based proton therapy, obtaining relative stopping power (RSP) maps from MRI involves converting MRI to CT, which introduces errors and uncertainties.</div></div><div><h3>Purpose</h3><div>We proposed a method based on deep learning to generate RSP values directly from MR images, eliminating the need for CT imaging. By bypassing the CT conversion step, our method improves the accuracy and efficiency of the RSP generation process.</div></div><div><h3>Method</h3><div>We implemented a cycle-consistent generative adversarial network (cycleGAN) to learn the nonlinear mapping between MR images and corresponding reference RSP maps. A total of 1000 pairs of T1-weighted MRI images from 5 patients and their related RSP maps were used to train the network. We had MR-CT paired images available, and to create reference RSP maps, we utilized the Hounsfield Look-Up Table (HLUT) to relate each Hounsfield unit (HU) value in the CT image to its corresponding RSP value.</div></div><div><h3>Results</h3><div>The method was evaluated with 100 random slices of head images from 5 patients. Mean absolute error (MAE), normalized mean squared error (NMSE), mutual information (MI), root mean squared error (RMSE), and mean error (ME) were used to quantify the differences between the generated and reference RSP maps. The predicted RSP maps showed an average MAE of 1.13%, average NMSE of 1.51%, average MI of 3.61, average RMSE of 1.37%, and ME of −0.95%.</div></div><div><h3>Conclusion</h3><div>The proposed method offers an alternative approach for deriving RSP values directly from MR images, potentially reducing costs compared to state-of-the-art approaches that rely on CT images. Our method bypasses the need for CT-based RSP calculation, providing a more streamlined and cost-effective solution.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"229 ","pages":"Article 112545"},"PeriodicalIF":2.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035276","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

Fabrication of Kevlar based shielding material for attenuation of ionizing radiations

IF 2.8 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-17 DOI: 10.1016/j.radphyschem.2025.112540

Shubham Ghag , Shivanand Bhushan , Sibi Oommen , Suhas Yeshwant Nayak , J.P. Jaideep , S.V. Suryanarayana , P.M. Prajapati , Sachin Shet , Subbaiah Kv , Paresh Prajapati

{"title":"Fabrication of Kevlar based shielding material for attenuation of ionizing radiations","authors":"Shubham Ghag , Shivanand Bhushan , Sibi Oommen , Suhas Yeshwant Nayak , J.P. Jaideep , S.V. Suryanarayana , P.M. Prajapati , Sachin Shet , Subbaiah Kv , Paresh Prajapati","doi":"10.1016/j.radphyschem.2025.112540","DOIUrl":"10.1016/j.radphyschem.2025.112540","url":null,"abstract":"<div><div>The aim of this study is to fabricate a flexible, lightweight and less toxic alternative to pure lead for shielding against ionizing radiation. Composite material based on room temperature vulcanizing silicone rubber with different weight percentages of tungsten carbide, bismuth oxide and a smaller percentage of lead enrichment with Aramid fibre were fabricated. The mechanical parameters like tensile strength, percentage elongation at break, and physical property like density were measured for the prepared composites. Scanning Electron Microscope (SEM) and Energy dispersive X-ray spectroscopy (EDS) was performed for visualisation and characterization of the prepared composite. Radiation attenuation parameters like determination of Half Value Layer (HVL), Tenth Value Layer (TVL), Linear attenuation coefficient (LAC) & Mass attenuation coefficients (MAC) were carried out. Morphological and mechanical observations showed that the composition with 20% tungsten carbide: 60% Bismuth Oxide and 20% Lead showed superior mechanical properties as the concentration of Bismuth Oxide increased across the filler matrix. The sample prepared with 40 % tungsten carbide: 40% Bismuth Oxide and 20 % of Lead (TSN 3) exhibited good radiation shielding properties against the commonly used radioisotopes. Monte Carlo Neutron-Photon (MCNP) Simulation tools, are used to estimate the attenuation parameters, which are later experimentally determined using a radioactive source (Cesium-137) and Sodium Iodide detector for TSN-3 with the elemental composition.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"229 ","pages":"Article 112540"},"PeriodicalIF":2.8,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A method to obtain optimal relative electron densities of metallic samples for a density scaling-based commercial photon dose calculation algorithm

IF 2.8 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-16 DOI: 10.1016/j.radphyschem.2025.112520

Chang-Shiun Lin , Yi-Chun Tsai , Chun-Wei Wang , Liang-Hsin Chen , Hsiang-Chin Lu , Tsung-Yu Lin , Chia-Jung Wu , Li-Chien Wei , Hsiang-Kung Liang , Sung-Hsin Kuo

引用次数: 0

Chemical and thermal stability of thermoplastics in fast and mixed irradiation extremes

IF 2.8 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-16 DOI: 10.1016/j.radphyschem.2025.112533

Andrea Labouriau, Loren Espada-Castillo, John R. Stockdale, Adam Pacheco, Shelbie A. Legett, Steve Simmonds, Clinton Shonrock, Santosh Adhikari

引用次数: 0

The influence of gamma radiation on the mechanical performance, anisotropy, and oil resistance of NBR and HNBR composites reinforced with silica and lignin fillers 伽玛辐射对二氧化硅和木质素填料增强丁腈橡胶和HNBR复合材料力学性能、各向异性和耐油性能的影响

IF 2.8 3区物理与天体物理

Radiation Physics and Chemistry Pub Date : 2025-01-16 DOI: 10.1016/j.radphyschem.2025.112534

E.S. Fathy , Heba A. Raslan , H. Radi , Magdy A. Ali , Khaled F. El-Nemr

{"title":"The influence of gamma radiation on the mechanical performance, anisotropy, and oil resistance of NBR and HNBR composites reinforced with silica and lignin fillers","authors":"E.S. Fathy , Heba A. Raslan , H. Radi , Magdy A. Ali , Khaled F. El-Nemr","doi":"10.1016/j.radphyschem.2025.112534","DOIUrl":"10.1016/j.radphyschem.2025.112534","url":null,"abstract":"<div><div>In the present work, at room temperature via a mechanical rotary mill, various composites based on Acrylonitrile butadiene rubber (NBR) and Hydrogenated acrylonitrile butadiene rubber (HNBR) have been prepared. As a comparative behavior in both types of rubber, different types of composites were fabricated based on different ratios of silica (S) and lignin (L). After that, all composites were subjected to gamma radiation at different doses to study the effect of ionizing radiation on the prepared composites. The anisotropy comparisons were performed for fabricated composites derived from NBR and HNBR. The prepared composites were investigated by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA), and mechanical parameters, swelling in brake oil, and mechanical properties after immersion in oil. In general, the presence of silica and lignin in the rubber matrix improved the properties of the composites and revealed anisotropy behavior towards the two kinds of rubber. Significances moreover show that when 10 phr of silica is substituted by lignin, the mass loss temperatures for composites are decreased because lignin has a lower thermal degradation temperature than silica filler. Furthermore, the mechanical properties after brake oil immersion reveal that HNBR is more oil-resistant than NBR. Also, the studied parameters insured a strong coordination interaction occurred between Zn<sup>2+</sup> of ZnCl<sub>2</sub> particles and CN groups of NBR or HNBR matrix during heat pressing, which resulting in an enhancement of mechanical and thermal properties<strong>.</strong></div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"229 ","pages":"Article 112534"},"PeriodicalIF":2.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989029","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